├── .idea
    ├── .gitignore
    ├── vcs.xml
    ├── misc.xml
    ├── modules.xml
    ├── runConfigurations.xml
    └── uiDesigner.xml
├── out
    └── production
    │   └── Stacks And Queues
    │       ├── Stack_Implementation
    │           ├── StackMain.class
    │           ├── CustomStack.class
    │           ├── DynamicStack.class
    │           └── StackException.class
    │       └── Stack_Questions
    │           └── Previous_Smaller.class
├── src
    ├── Stack_Implementation
    │   ├── StackException.java
    │   ├── StackMain.java
    │   ├── DynamicStack.java
    │   ├── CustomStack.java
    │   └── Two_Stacks.java
    └── Stack_Questions
    │   ├── Delete_Middle_from_Stack.java
    │   ├── ReverseString.java
    │   ├── ParenthesisMatching.java
    │   └── Previous_Smaller.java
└── Stacks And Queues.iml


/.idea/.gitignore:
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1 | # Default ignored files
2 | /shelf/
3 | /workspace.xml
4 | 


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/out/production/Stacks And Queues/Stack_Implementation/StackMain.class:
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https://raw.githubusercontent.com/AyushSoni86/Stacks_and_Queues/HEAD/out/production/Stacks And Queues/Stack_Implementation/StackMain.class


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/out/production/Stacks And Queues/Stack_Implementation/CustomStack.class:
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https://raw.githubusercontent.com/AyushSoni86/Stacks_and_Queues/HEAD/out/production/Stacks And Queues/Stack_Implementation/CustomStack.class


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/out/production/Stacks And Queues/Stack_Questions/Previous_Smaller.class:
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https://raw.githubusercontent.com/AyushSoni86/Stacks_and_Queues/HEAD/out/production/Stacks And Queues/Stack_Questions/Previous_Smaller.class


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/.idea/vcs.xml:
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1 | <?xml version="1.0" encoding="UTF-8"?>
2 | <project version="4">
3 |   <component name="VcsDirectoryMappings">
4 |     <mapping directory="$PROJECT_DIR$" vcs="Git" />
5 |   </component>
6 | </project>


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/out/production/Stacks And Queues/Stack_Implementation/DynamicStack.class:
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https://raw.githubusercontent.com/AyushSoni86/Stacks_and_Queues/HEAD/out/production/Stacks And Queues/Stack_Implementation/DynamicStack.class


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/out/production/Stacks And Queues/Stack_Implementation/StackException.class:
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https://raw.githubusercontent.com/AyushSoni86/Stacks_and_Queues/HEAD/out/production/Stacks And Queues/Stack_Implementation/StackException.class


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/src/Stack_Implementation/StackException.java:
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1 | package Stack_Implementation;
2 | 
3 | public class StackException extends Exception{
4 |     public StackException(String msg){
5 |         super(msg);
6 |     }
7 | }
8 | 


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/.idea/misc.xml:
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1 | <?xml version="1.0" encoding="UTF-8"?>
2 | <project version="4">
3 |   <component name="ProjectRootManager" version="2" languageLevel="JDK_16" default="true" project-jdk-name="16" project-jdk-type="JavaSDK">
4 |     <output url="file://$PROJECT_DIR$/out" />
5 |   </component>
6 | </project>


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/.idea/modules.xml:
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1 | <?xml version="1.0" encoding="UTF-8"?>
2 | <project version="4">
3 |   <component name="ProjectModuleManager">
4 |     <modules>
5 |       <module fileurl="file://$PROJECT_DIR$/Stacks And Queues.iml" filepath="$PROJECT_DIR$/Stacks And Queues.iml" />
6 |     </modules>
7 |   </component>
8 | </project>


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/.idea/runConfigurations.xml:
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 1 | <?xml version="1.0" encoding="UTF-8"?>
 2 | <project version="4">
 3 |   <component name="RunConfigurationProducerService">
 4 |     <option name="ignoredProducers">
 5 |       <set>
 6 |         <option value="com.android.tools.idea.compose.preview.runconfiguration.ComposePreviewRunConfigurationProducer" />
 7 |       </set>
 8 |     </option>
 9 |   </component>
10 | </project>


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/Stacks And Queues.iml:
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 1 | <?xml version="1.0" encoding="UTF-8"?>
 2 | <module type="JAVA_MODULE" version="4">
 3 |   <component name="NewModuleRootManager" inherit-compiler-output="true">
 4 |     <exclude-output />
 5 |     <content url="file://$MODULE_DIR$">
 6 |       <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
 7 |     </content>
 8 |     <orderEntry type="inheritedJdk" />
 9 |     <orderEntry type="sourceFolder" forTests="false" />
10 |   </component>
11 | </module>


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/src/Stack_Implementation/StackMain.java:
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 1 | package Stack_Implementation;
 2 | 
 3 | public class StackMain {
 4 |     public static void main(String[] args) throws StackException {
 5 |         CustomStack stack = new DynamicStack(5);
 6 |         stack.push(10);
 7 |         stack.push(20);
 8 |         stack.push(30);
 9 |         stack.push(40);
10 |         stack.push(50);
11 |         stack.push(60);
12 | 
13 | //        stack.pop();
14 | //        stack.pop();
15 | //        stack.pop();
16 | //        stack.pop();
17 | //        stack.pop();
18 | //        stack.pop();
19 |     }
20 | }
21 | 


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/src/Stack_Questions/Delete_Middle_from_Stack.java:
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 1 | package Stack_Questions;
 2 | 
 3 | import java.util.Stack;
 4 | 
 5 | public class Delete_Middle_from_Stack {
 6 |     public void deleteMid(Stack<Integer> stack, int size) {
 7 |         solve(stack, 0, size);
 8 |     }
 9 | 
10 |     private void solve(Stack<Integer> stack, int count, int size) {
11 |         if (count == size / 2) {
12 |             stack.pop();
13 |             return;
14 |         }
15 |         int temp = stack.peek();
16 |         stack.pop();
17 |         solve(stack, count + 1, size);
18 |         stack.push(temp);
19 |     }
20 | }
21 | 


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/src/Stack_Implementation/DynamicStack.java:
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 1 | package Stack_Implementation;
 2 | 
 3 | // Growable stack using array
 4 | public class DynamicStack extends CustomStack {
 5 |     public DynamicStack() {
 6 |         super();
 7 |     }
 8 | 
 9 |     public DynamicStack(int size) {
10 |         super(size);
11 |     }
12 | 
13 |     @Override
14 |     public boolean push(int item) {
15 |         if (this.isFull()) {
16 |             int[] temp = new int[data.length * 2];
17 |             for (int i = 0; i < data.length; i++) {
18 |                 temp[i] = data[i];
19 |             }
20 |             data = temp;
21 |         }
22 |         return super.push(item);
23 |     }
24 | 
25 | }
26 | 


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/src/Stack_Questions/ReverseString.java:
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 1 | package Stack_Questions;
 2 | 
 3 | import java.util.Stack;
 4 | 
 5 | public class ReverseString {
 6 |     // reverse a string using stack
 7 |     public static void main(String[] args) {
 8 |         String str = "Ayush";
 9 |         reverse(str);
10 |     }
11 | 
12 |     static void reverse(String str) {
13 |         Stack<Character> stack = new Stack<>();
14 |         for (int i = 0; i < str.length(); i++) {
15 |             stack.push(str.charAt(i));
16 |         }
17 |         String temp = "";
18 |         while (!stack.isEmpty()) {
19 |             char ch = stack.peek();
20 |             temp = temp + ch;
21 |             stack.pop();
22 |         }
23 |         System.out.println(temp);
24 |     }
25 | }
26 | 


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/src/Stack_Questions/ParenthesisMatching.java:
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 1 | package Stack_Questions;
 2 | 
 3 | import java.util.Stack;
 4 | 
 5 | public class ParenthesisMatching {
 6 | 
 7 |     public static void main(String[] args) {
 8 |         String str = "()[]{}" ;
 9 |         System.out.println(isValid(str));
10 |     }
11 | 
12 |     public static boolean isValid(String str) {
13 |         Stack<Character> s = new Stack<>();
14 |         for (int i = 0; i < str.length(); i++) {
15 |             char ch = str.charAt(i);
16 |             if (isOpening(ch)) {
17 |                 s.push(ch);
18 |             } else {
19 |                 if (s.isEmpty()) return false;
20 |                 else if (!isMatch( s.peek(), ch)) return false;
21 |                 else s.pop();
22 |             }
23 |         }
24 |         return s.isEmpty();
25 |     }
26 | 
27 |     private static boolean isOpening(char ch) {
28 |         return ch == '(' || ch == '[' || ch == '{';
29 |     }
30 | 
31 |     private static boolean isMatch(char a, char b) {
32 |         return  (a == '(' && b == ')') ||
33 |                 (a == '[' && b == ']') ||
34 |                 (a == '{' && b == '}');
35 |     }
36 | }
37 | 


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/src/Stack_Implementation/CustomStack.java:
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 1 | package Stack_Implementation;
 2 | 
 3 | public class CustomStack {
 4 |     private static final int DEFAULT_SIZE = 10;
 5 |     protected int[] data;
 6 |     int top = -1;
 7 | 
 8 |     public CustomStack() {
 9 |         this(DEFAULT_SIZE);
10 |     }
11 | 
12 |     public CustomStack(int size) {
13 |         this.data = new int[size];
14 |     }
15 | 
16 |     public boolean isFull() {
17 |         return top == data.length - 1;  // ptr is at last index
18 |     }
19 | 
20 |     public boolean isEmpty() {
21 |         return top == -1;
22 |     }
23 | 
24 |     public int size() {
25 |         return top + 1;
26 |     }
27 | 
28 |     public boolean push(int item) {
29 |         if (isFull()) {
30 |             System.out.println("Cannot push Stack is full !!");
31 |         }
32 |         top++;
33 |         data[top] = item;
34 |         return true;
35 |     }
36 | 
37 |     public int pop() throws StackException {
38 |         if (isEmpty()) {
39 |             throw new StackException("Connot pop from an empty stack!!");
40 |         }
41 |         return data[top--];
42 |     }
43 | 
44 |     public int peek() throws StackException {
45 |         if (isEmpty()) {
46 |             throw new StackException("Cannot peek from an empty stack");
47 |         }
48 |         return data[top];
49 |     }
50 | 
51 | }
52 | 


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/src/Stack_Implementation/Two_Stacks.java:
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 1 | package Stack_Implementation;
 2 | 
 3 | public class Two_Stacks {
 4 |     // question from code studio -
 5 |     // https://www.codingninjas.com/codestudio/problems/two-stacks_983634?leftPanelTab=1
 6 |     // create two stacks using single array
 7 |     int[] data;
 8 |     int size;
 9 |     int top1;
10 |     int top2;
11 | 
12 |     // Initialize TwoStack.
13 |     public Two_Stacks(int s) {
14 |         this.size = s;
15 |         this.data = new int[s];
16 |         top1 = -1;
17 |         top2 = s;
18 |     }
19 | 
20 |     // push from front of the array in stack 1
21 |     public void push1(int item) {
22 |         if (top2 - top1 > 1) {
23 |             data[top1++] = item;
24 |         } else {
25 |             System.out.println("stack is full!!");
26 |         }
27 |     }
28 | 
29 |     // push from backside of the array in stack 2
30 |     public void push2(int item) {
31 |         if (top2 - top1 > 1) {
32 |             data[top2--] = item;
33 |         } else {
34 |             System.out.println("stack is full!!");
35 |         }
36 |     }
37 | 
38 |     // pop from front of the array from stack 1
39 |     public int pop1() {
40 |         if (top1 > -1) return data[top1--];
41 |         else return -1;
42 |     }
43 | 
44 |     // pop from backside of the array from stack 2
45 |     public int pop2() {
46 |         if (top2 < size) return data[top2++];
47 |         else return -1;
48 |     }
49 | }
50 | 


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/src/Stack_Questions/Previous_Smaller.java:
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 1 | package Stack_Questions;
 2 | 
 3 | import java.util.Arrays;
 4 | import java.util.Stack;
 5 | 
 6 | //contains four sub-questions
 7 | public class Previous_Smaller {
 8 |     public static void main(String[] args) {
 9 |         int[] arr = {4, 10, 5, 8, 20, 15, 3, 12};
10 |         previousSmaller(arr);
11 |         System.out.println();
12 |         previousGreater(arr);
13 |         System.out.println();
14 |         int[] arr2 = {3, 10, 5, 1, 15, 10, 7, 6};
15 |         System.out.println(Arrays.toString(nextGreater(arr2)));
16 |         System.out.println(Arrays.toString(nextSmaller(arr2)));
17 |     }
18 | 
19 |     //Q1. code for previous smaller element in an array
20 |     static void previousSmaller(int[] arr) {
21 |         Stack<Integer> stack = new Stack<>();
22 |         for (int i = 0; i < arr.length; i++) {
23 |             while (!stack.isEmpty() && stack.peek() >= arr[i]) {
24 |                 stack.pop();
25 |             }
26 |             if (stack.isEmpty()) System.out.print("-1 ");
27 |             else System.out.print(stack.peek() + " ");
28 |             stack.push(arr[i]);
29 |         }
30 |     }
31 | 
32 |     //Q2. code for previous greater element in an array
33 |     static void previousGreater(int[] arr) {
34 |         Stack<Integer> stack = new Stack<>();
35 |         for (int i = 0; i < arr.length; i++) {
36 |             while (!stack.isEmpty() && stack.peek() <= arr[i]) {
37 |                 stack.pop();
38 |             }
39 |             if (stack.isEmpty()) System.out.print("-1 ");
40 |             else System.out.print(stack.peek() + " ");
41 |             stack.push(arr[i]);
42 |         }
43 |     }
44 | 
45 |     //Q3. code for next smaller element in an array
46 |     static int[] nextSmaller(int[] arr) {
47 |         Stack<Integer> stack = new Stack<>();
48 |         int[] temp = new int[arr.length];
49 |         for (int i = arr.length - 1; i >= 0; i--) {
50 |             while (!stack.isEmpty() && stack.peek() >= arr[i]) {
51 |                 stack.pop();
52 |             }
53 |             if (stack.isEmpty()) temp[i] = -1;
54 |             else temp[i] = stack.peek();
55 |             stack.push(arr[i]);
56 |         }
57 |         return temp;
58 |     }
59 | 
60 |     //Q4. code for next greater element in an array
61 |     static int[] nextGreater(int[] arr) {
62 |         Stack<Integer> stack = new Stack<>();
63 |         int[] temp = new int[arr.length];
64 |         for (int i = arr.length - 1; i >= 0; i--) {
65 |             while (!stack.isEmpty() && stack.peek() <= arr[i]) {
66 |                 stack.pop();
67 |             }
68 |             if (stack.isEmpty()) temp[i] = -1;
69 |             else temp[i] = stack.peek();
70 |             stack.push(arr[i]);
71 |         }
72 |         return temp;
73 |     }
74 | }
75 | 


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/.idea/uiDesigner.xml:
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  1 | <?xml version="1.0" encoding="UTF-8"?>
  2 | <project version="4">
  3 |   <component name="Palette2">
  4 |     <group name="Swing">
  5 |       <item class="com.intellij.uiDesigner.HSpacer" tooltip-text="Horizontal Spacer" icon="/com/intellij/uiDesigner/icons/hspacer.png" removable="false" auto-create-binding="false" can-attach-label="false">
  6 |         <default-constraints vsize-policy="1" hsize-policy="6" anchor="0" fill="1" />
  7 |       </item>
  8 |       <item class="com.intellij.uiDesigner.VSpacer" tooltip-text="Vertical Spacer" icon="/com/intellij/uiDesigner/icons/vspacer.png" removable="false" auto-create-binding="false" can-attach-label="false">
  9 |         <default-constraints vsize-policy="6" hsize-policy="1" anchor="0" fill="2" />
 10 |       </item>
 11 |       <item class="javax.swing.JPanel" icon="/com/intellij/uiDesigner/icons/panel.png" removable="false" auto-create-binding="false" can-attach-label="false">
 12 |         <default-constraints vsize-policy="3" hsize-policy="3" anchor="0" fill="3" />
 13 |       </item>
 14 |       <item class="javax.swing.JScrollPane" icon="/com/intellij/uiDesigner/icons/scrollPane.png" removable="false" auto-create-binding="false" can-attach-label="true">
 15 |         <default-constraints vsize-policy="7" hsize-policy="7" anchor="0" fill="3" />
 16 |       </item>
 17 |       <item class="javax.swing.JButton" icon="/com/intellij/uiDesigner/icons/button.png" removable="false" auto-create-binding="true" can-attach-label="false">
 18 |         <default-constraints vsize-policy="0" hsize-policy="3" anchor="0" fill="1" />
 19 |         <initial-values>
 20 |           <property name="text" value="Button" />
 21 |         </initial-values>
 22 |       </item>
 23 |       <item class="javax.swing.JRadioButton" icon="/com/intellij/uiDesigner/icons/radioButton.png" removable="false" auto-create-binding="true" can-attach-label="false">
 24 |         <default-constraints vsize-policy="0" hsize-policy="3" anchor="8" fill="0" />
 25 |         <initial-values>
 26 |           <property name="text" value="RadioButton" />
 27 |         </initial-values>
 28 |       </item>
 29 |       <item class="javax.swing.JCheckBox" icon="/com/intellij/uiDesigner/icons/checkBox.png" removable="false" auto-create-binding="true" can-attach-label="false">
 30 |         <default-constraints vsize-policy="0" hsize-policy="3" anchor="8" fill="0" />
 31 |         <initial-values>
 32 |           <property name="text" value="CheckBox" />
 33 |         </initial-values>
 34 |       </item>
 35 |       <item class="javax.swing.JLabel" icon="/com/intellij/uiDesigner/icons/label.png" removable="false" auto-create-binding="false" can-attach-label="false">
 36 |         <default-constraints vsize-policy="0" hsize-policy="0" anchor="8" fill="0" />
 37 |         <initial-values>
 38 |           <property name="text" value="Label" />
 39 |         </initial-values>
 40 |       </item>
 41 |       <item class="javax.swing.JTextField" icon="/com/intellij/uiDesigner/icons/textField.png" removable="false" auto-create-binding="true" can-attach-label="true">
 42 |         <default-constraints vsize-policy="0" hsize-policy="6" anchor="8" fill="1">
 43 |           <preferred-size width="150" height="-1" />
 44 |         </default-constraints>
 45 |       </item>
 46 |       <item class="javax.swing.JPasswordField" icon="/com/intellij/uiDesigner/icons/passwordField.png" removable="false" auto-create-binding="true" can-attach-label="true">
 47 |         <default-constraints vsize-policy="0" hsize-policy="6" anchor="8" fill="1">
 48 |           <preferred-size width="150" height="-1" />
 49 |         </default-constraints>
 50 |       </item>
 51 |       <item class="javax.swing.JFormattedTextField" icon="/com/intellij/uiDesigner/icons/formattedTextField.png" removable="false" auto-create-binding="true" can-attach-label="true">
 52 |         <default-constraints vsize-policy="0" hsize-policy="6" anchor="8" fill="1">
 53 |           <preferred-size width="150" height="-1" />
 54 |         </default-constraints>
 55 |       </item>
 56 |       <item class="javax.swing.JTextArea" icon="/com/intellij/uiDesigner/icons/textArea.png" removable="false" auto-create-binding="true" can-attach-label="true">
 57 |         <default-constraints vsize-policy="6" hsize-policy="6" anchor="0" fill="3">
 58 |           <preferred-size width="150" height="50" />
 59 |         </default-constraints>
 60 |       </item>
 61 |       <item class="javax.swing.JTextPane" icon="/com/intellij/uiDesigner/icons/textPane.png" removable="false" auto-create-binding="true" can-attach-label="true">
 62 |         <default-constraints vsize-policy="6" hsize-policy="6" anchor="0" fill="3">
 63 |           <preferred-size width="150" height="50" />
 64 |         </default-constraints>
 65 |       </item>
 66 |       <item class="javax.swing.JEditorPane" icon="/com/intellij/uiDesigner/icons/editorPane.png" removable="false" auto-create-binding="true" can-attach-label="true">
 67 |         <default-constraints vsize-policy="6" hsize-policy="6" anchor="0" fill="3">
 68 |           <preferred-size width="150" height="50" />
 69 |         </default-constraints>
 70 |       </item>
 71 |       <item class="javax.swing.JComboBox" icon="/com/intellij/uiDesigner/icons/comboBox.png" removable="false" auto-create-binding="true" can-attach-label="true">
 72 |         <default-constraints vsize-policy="0" hsize-policy="2" anchor="8" fill="1" />
 73 |       </item>
 74 |       <item class="javax.swing.JTable" icon="/com/intellij/uiDesigner/icons/table.png" removable="false" auto-create-binding="true" can-attach-label="false">
 75 |         <default-constraints vsize-policy="6" hsize-policy="6" anchor="0" fill="3">
 76 |           <preferred-size width="150" height="50" />
 77 |         </default-constraints>
 78 |       </item>
 79 |       <item class="javax.swing.JList" icon="/com/intellij/uiDesigner/icons/list.png" removable="false" auto-create-binding="true" can-attach-label="false">
 80 |         <default-constraints vsize-policy="6" hsize-policy="2" anchor="0" fill="3">
 81 |           <preferred-size width="150" height="50" />
 82 |         </default-constraints>
 83 |       </item>
 84 |       <item class="javax.swing.JTree" icon="/com/intellij/uiDesigner/icons/tree.png" removable="false" auto-create-binding="true" can-attach-label="false">
 85 |         <default-constraints vsize-policy="6" hsize-policy="6" anchor="0" fill="3">
 86 |           <preferred-size width="150" height="50" />
 87 |         </default-constraints>
 88 |       </item>
 89 |       <item class="javax.swing.JTabbedPane" icon="/com/intellij/uiDesigner/icons/tabbedPane.png" removable="false" auto-create-binding="true" can-attach-label="false">
 90 |         <default-constraints vsize-policy="3" hsize-policy="3" anchor="0" fill="3">
 91 |           <preferred-size width="200" height="200" />
 92 |         </default-constraints>
 93 |       </item>
 94 |       <item class="javax.swing.JSplitPane" icon="/com/intellij/uiDesigner/icons/splitPane.png" removable="false" auto-create-binding="false" can-attach-label="false">
 95 |         <default-constraints vsize-policy="3" hsize-policy="3" anchor="0" fill="3">
 96 |           <preferred-size width="200" height="200" />
 97 |         </default-constraints>
 98 |       </item>
 99 |       <item class="javax.swing.JSpinner" icon="/com/intellij/uiDesigner/icons/spinner.png" removable="false" auto-create-binding="true" can-attach-label="true">
100 |         <default-constraints vsize-policy="0" hsize-policy="6" anchor="8" fill="1" />
101 |       </item>
102 |       <item class="javax.swing.JSlider" icon="/com/intellij/uiDesigner/icons/slider.png" removable="false" auto-create-binding="true" can-attach-label="false">
103 |         <default-constraints vsize-policy="0" hsize-policy="6" anchor="8" fill="1" />
104 |       </item>
105 |       <item class="javax.swing.JSeparator" icon="/com/intellij/uiDesigner/icons/separator.png" removable="false" auto-create-binding="false" can-attach-label="false">
106 |         <default-constraints vsize-policy="6" hsize-policy="6" anchor="0" fill="3" />
107 |       </item>
108 |       <item class="javax.swing.JProgressBar" icon="/com/intellij/uiDesigner/icons/progressbar.png" removable="false" auto-create-binding="true" can-attach-label="false">
109 |         <default-constraints vsize-policy="0" hsize-policy="6" anchor="0" fill="1" />
110 |       </item>
111 |       <item class="javax.swing.JToolBar" icon="/com/intellij/uiDesigner/icons/toolbar.png" removable="false" auto-create-binding="false" can-attach-label="false">
112 |         <default-constraints vsize-policy="0" hsize-policy="6" anchor="0" fill="1">
113 |           <preferred-size width="-1" height="20" />
114 |         </default-constraints>
115 |       </item>
116 |       <item class="javax.swing.JToolBar$Separator" icon="/com/intellij/uiDesigner/icons/toolbarSeparator.png" removable="false" auto-create-binding="false" can-attach-label="false">
117 |         <default-constraints vsize-policy="0" hsize-policy="0" anchor="0" fill="1" />
118 |       </item>
119 |       <item class="javax.swing.JScrollBar" icon="/com/intellij/uiDesigner/icons/scrollbar.png" removable="false" auto-create-binding="true" can-attach-label="false">
120 |         <default-constraints vsize-policy="6" hsize-policy="0" anchor="0" fill="2" />
121 |       </item>
122 |     </group>
123 |   </component>
124 | </project>


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