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Copy pathbasics.java
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65 lines (54 loc) · 1.85 KB
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import java.util.*;
public class basics {
public static void main(String[] args) {
List<Integer> nums = new ArrayList<>();
List<Integer> nums2 = new ArrayList<>();
nums2.add(1000);
nums2.add(2000);
// Adding elements
nums.add(10);
nums.add(20);
System.out.println(nums);
// Adding elements at a position
nums.add(1, 99);
System.out.println(nums);
// Appending 2 array lists
nums.addAll(nums2);
System.out.println(nums);
// Removing elements
// Remove 1st occurence With value
nums.add(1000);
nums.remove(Integer.valueOf(1000));
System.out.println(nums);
// Remove at index
nums.remove(1);
System.out.println(nums);
// Updating values at particular positions
nums.set(1, 9999);
System.out.println(nums + "\n");
// Checking wheather an element exists or not
if (nums.contains(999))
System.out.println("999 is in the ArrayList !");
else
System.out.println("999 is not in the ArrayList !");
System.out.println();
// Iterating through ArrayLists !
// Using for-Each Loop
for (Integer number : nums) {
System.out.println("Number is " + number);
}
System.out.println();
// Using Iterator Interface
Iterator<Integer> it = nums.iterator();
while(it.hasNext()) {
System.out.print(it.next()+" ");
}
System.out.println("\n");
// Using simple index based for loop
for(int i = 0; i < nums.size(); i++)
System.out.println("Number @ position " + i + " is " + nums.get(i));
nums.clear();
System.out.println("Cleared out all the numbers....");
System.out.println(nums);
}
}