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Java find output programs (switch case) | set 2

Find the output of Java programs | switch case | Set 2: Enhance the knowledge of Java switch case concepts by solving and finding the output of some Java programs.
Submitted by Nidhi, on January 30, 2021

Question 1:

public class Main {
  public static void main(String[] args) {
    int num = -4;

    switch (num) {
    case 5 - 1 : System.out.println("www.includehelp.com");
      break;
    case 15 - 11 : System.out.println("www.google.com");
      break;
    default:
      System.out.println("Wrong option");
      break;
    }
  }
}

Output:

Main.java:8: error: duplicate case label
    case 15 - 11 : System.out.println("www.google.com");
    ^
1 error

Explanation:

The above program will generate a syntax error because we cannot use duplicate cases in the switch block.

Question 2:

public class Main {
  public static void main(String[] args) {
    int num = -4;

    switch (num) {
    default:
      System.out.println("Wrong option");
    case 5 - 1 : System.out.println("www.includehelp.com");
      break;
    case 15 - 12 : System.out.println("www.google.com");
      break;
    }
  }
}

Output:

Wrong option
www.includehelp.com

Explanation:

In the above program, we create a local variable initialized with -4. Here we did not use the break statement in default case that's why it will execute default case as well as "case 5-1".

Question 3:

public class Main {
  public static void main(String[] args) {
    switch (14 % 4) {
    case 1:
      System.out.println("www.includehelp.com");
      break;
    case 2:
      System.out.println("www.fb.com");
    case 3:
      System.out.println("www.google.com");
      break;
    default:
      System.out.println("wrong choice");
      break;
    }
  }
}

Output:

www.fb.com
www.google.com

Explanation:

In the above program, we used "14%4" in switch condition, then it will return 2 then "case 2" will execute but we did not use break statement in "case 2" that’s why "case 3" will also execute.

Question 4:

public class Main {
  public static void main(String[] args) {
    switch (30 * 30 / 30) {
    case 10:
      System.out.println("www.includehelp.com");
      break;
    case 20:
      System.out.println("www.fb.com");
      break;
    case 30:
      System.out.println("www.google.com");
      break;
    default:
      System.out.println("wrong choice");
      break:
    }
  }
}

Output:

Main.java:15: error: ';' expected
      break:
           ^
1 error

Explanation:

The above program will generate a syntax error because we below statement.

default:
    System.out.println("wrong choice");
    break:

Here we used colon ":" instead of ";" in above break statement.

Question 5:

public class Main {
  public static void main(String[] args) {
    String STR = "hello";
    switch (STR) {
    case "HELLO":
      System.out.println("@@@@@@@@@@@@@@@");
      break;
    case "hello":
      System.out.println("$$$$$$$$$$$$$$$");
      break;
    case "STR":
      System.out.println("!!!!!!!!!!!!!!!!!!!!!!!!");
      break;
    default:
      System.out.println("###############");
      break;
    }
  }
}

Output:

$$$$$$$$$$$$$$$

Explanation:

In the above program, we created a class Main that contains a main() method, in the main() method we created a string variable STR, which is initialized with "hello". Then (case "hello") will execute and print "$$$$$$$$$$$$$$$" on the console screen.



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