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Wrapper Class Vs Primitive types Output 1

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public class Tester {  public static void main(String[] args) {     Integer sum1 = 125; //line 1     int sum2 = 125; //line 2     System.out.print(sum1.equals(sum2)); //line 3     System.out.print(sum2.equals(sum1)); //line 4     System.out.print(sum1==sum2); //line 5  } } Output: 1. Compilation error at line 3  2. Compilation error at line 4  3. truetruefalse  4. truetrueture
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String Concept

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public static void main(String[] args) { boolean stmt1 = "champ" == "champ"; boolean stmt2 = new String("champ") == "champ"; boolean stmt3 = new String("champ") == new String("champ"); System.out.println(stmt1 && stmt2 || stmt3); } The output is false
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Array Output 2

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public class JavaRecipe{      public static void main(String[] jr){           int[] arr = new int[0];           System.out.println(arr.length); //line 1           arr[0] = 10; //line 2           Ststem.out.println(arr[0]); //line 3                    } } 1. Compilation error at Line 1 : size of array cant be 0 2. Runntime error at Line 2 : ArrayIndexOutOfBoundException 3. Compiles fine and gives output as 0 10 4. Runntime error at line 1 & 3 : NullPointerException
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