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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").equals(new String("champ"));       boolean stmt3 = "champ".toString()=="champ";     System.out.println(stmt1 && stmt2 && stmt3);  } The output is true
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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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Java Constructor 2 !?

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What is the expected output? class Plant {       Plant() {       System.out.println("Plant created"); } } class Tree extends Plant {        Tree() {        System.out.println("Tree created");        super(); } } public class Test { public static void main(String args[]) {        Tree tree = new Tree(); } } Please choose only one answer: 1)    Plant created        Tree created 2)    Tree created        Plant created 3)    RuntimeException 4)     Compilation error
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