From 33575a68631e9270c06206d22d257ed5f2b41f9c Mon Sep 17 00:00:00 2001
From: unknown <sohamgadekar67@gmail.com>
Date: Thu, 26 Feb 2026 12:59:05 +0530
Subject: [PATCH] first commit

---
 TestJavaCollection4.java  | 23 +++++++++++++++++++++++
 TestJavaCollection7.java  | 19 +++++++++++++++++++
 TestJavaCollection8.java  | 16 ++++++++++++++++
 TestJavaCollection8b.java | 17 +++++++++++++++++
 TestJavaCollection8c.java | 17 +++++++++++++++++
 TestJavaCollection9.java  | 18 ++++++++++++++++++
 TestJavaCollection9b.java | 18 ++++++++++++++++++
 7 files changed, 128 insertions(+)
 create mode 100644 TestJavaCollection4.java
 create mode 100644 TestJavaCollection7.java
 create mode 100644 TestJavaCollection8.java
 create mode 100644 TestJavaCollection8b.java
 create mode 100644 TestJavaCollection8c.java
 create mode 100644 TestJavaCollection9.java
 create mode 100644 TestJavaCollection9b.java

diff --git a/TestJavaCollection4.java b/TestJavaCollection4.java
new file mode 100644
index 0000000..3ccd362
--- /dev/null
+++ b/TestJavaCollection4.java
@@ -0,0 +1,23 @@
+// Write a java code to demo stack
+import java.util.*;
+public class TestJavaCollection4{
+public static void main(String args[]){
+Stack<String> stack = new Stack<String>();
+stack.push("Ayush");
+stack.push("Garvit");
+stack.push("Amit");
+stack.push("Ashish");
+stack.push("Garvit");
+Iterator<String> itr=stack.iterator();
+while(itr.hasNext()){
+System.out.println(itr.next());
+}
+String topElement = stack.peek();
+System.out.println("The top element of the stack is: "+ topElement);
+stack.pop()
+System.out.println("After POP");
+for(String element : stack){
+    System.out.println(element);
+}
+}
+}
\ No newline at end of file
diff --git a/TestJavaCollection7.java b/TestJavaCollection7.java
new file mode 100644
index 0000000..958b544
--- /dev/null
+++ b/TestJavaCollection7.java
@@ -0,0 +1,19 @@
+//Hashset
+import java.util.*;
+public class TestJavaCollection7{
+public static void main(String args[]){
+    HashSet<String> set=new HashSet<String>();
+    set.add("Ravi");
+    set.add("Vijay");
+    set.add("Ravi");
+    set.add("Ajay");
+    set.add(null);
+
+    Iterator<String>itr=set.iterator();
+    while(itr.hasNext()){
+    System.out.println(itr.next());
+    }
+
+}
+
+}
diff --git a/TestJavaCollection8.java b/TestJavaCollection8.java
new file mode 100644
index 0000000..6a9101e
--- /dev/null
+++ b/TestJavaCollection8.java
@@ -0,0 +1,16 @@
+//WAJ to demo linkedhash set
+import java.util.*;
+public class TestJavaCollection8{
+    public static void main(String args[]){
+    LinkedHashSet<String> set=new LinkedHashSet<String>();
+    set.add("Ravi");
+    set.add("Vijay");
+    set.add("ravi");
+    set.add("Ajay");
+
+    Iterator<String> itr=set.iterator();
+    while(itr.hasNext()){
+    System.out.println(itr.next());
+    }
+    }
+}
diff --git a/TestJavaCollection8b.java b/TestJavaCollection8b.java
new file mode 100644
index 0000000..6f29cfe
--- /dev/null
+++ b/TestJavaCollection8b.java
@@ -0,0 +1,17 @@
+/WAJ to demo linkedhash set
+import java.util.*;
+public class TestJavaCollection8{
+    public static void main(String args[]){
+    LinkedHashSet<String> set=new LinkedHashSet<String>();
+    set.add("Ravi");
+    set.add("Vijay");
+    set.add("");
+    set.add("Ravi");
+    set.add("Ajay");
+
+    Iterator<String> itr=set.iterator();
+    while(itr.hasNext()){
+    System.out.println(itr.next());
+    }
+    }
+}
\ No newline at end of file
diff --git a/TestJavaCollection8c.java b/TestJavaCollection8c.java
new file mode 100644
index 0000000..769606e
--- /dev/null
+++ b/TestJavaCollection8c.java
@@ -0,0 +1,17 @@
+//WAJ to demo linkedhash set
+import java.util.*;
+public class TestJavaCollection8c{
+    public static void main(String args[]){
+    LinkedHashSet<String> set=new LinkedHashSet<String>();
+    set.add("Ravi");
+    set.add("Vijay");
+    set.add(null);
+    set.add("Ravi");
+    set.add("Ajay");
+
+    Iterator<String> itr=set.iterator();
+    while(itr.hasNext()){
+    System.out.println(itr.next());
+    }
+    }
+}
diff --git a/TestJavaCollection9.java b/TestJavaCollection9.java
new file mode 100644
index 0000000..a4a6dc2
--- /dev/null
+++ b/TestJavaCollection9.java
@@ -0,0 +1,18 @@
+
+//WAJ to demo Treeset
+import java.util.*;
+public class TestJavaCollection9{
+    public static void main(String args[]){
+    TreeSet<String> set=new TreeSet<String>();
+    set.add("Ravi");
+    set.add("Vijay");
+    set.add("Ajay");
+    set.add("Ravi");
+    set.add("Ajay");
+
+    Iterator<String> itr=set.iterator();
+    while(itr.hasNext()){
+    System.out.println(itr.next());
+    }
+    }
+}
\ No newline at end of file
diff --git a/TestJavaCollection9b.java b/TestJavaCollection9b.java
new file mode 100644
index 0000000..bf3c464
--- /dev/null
+++ b/TestJavaCollection9b.java
@@ -0,0 +1,18 @@
+//WAJ to demo Treeset
+import java.util.*;
+public class TestJavaCollection9b{
+    public static void main(String args[]){
+    TreeSet<String> set=new TreeSet<String>();
+    set.add("Ravi");
+    set.add("Vijay");
+    set.add("");
+    set.add(null);
+    set.add("Ravi");
+    set.add("Ajay");
+
+    Iterator<String> itr=set.iterator();
+    while(itr.hasNext()){
+    System.out.println(itr.next());
+    }
+    }
+}