Java Interview Questions

Swith Statement

1. What is the output of the class

public class SwithClass {

public static void main(String a[]){

int price = 6;
switch (price) {

case 1: System.out.println("case 1");
case 3: System.out.println("case 3");
default: System.out.println("It is: default");
case 9: System.out.println("case 9");

}
}
}



2. output?

public class StringEquals {

public static void main(String[] args) {

String str = "abc";
String str1="abc";
System.out.println(str.equals(null) | str1.equals("abc"));
System.out.println(str.equals(null) || str1.equals("abc"));


}

}




3. Which method it calls?

public static void main(String[] args) {
method(null);
}
public static void method(Object o) {
System.out.println("Object impl");
}
public static void method(String s) {
System.out.println("String impl");
}



4. What is the output if flag is true or flag is false

boolean flag= false;

try {
if (flag) {
while (true) {

}
} else {
System.exit(0);
}
} finally {
System.out.println("In Finally");
}



5. Predict what is the output

String s1 = "abc";
String s2 = "abc";

String abc = new String("Abc");

boolean s3 = s1 == s2;

System.out.println(s1 == s2);
System.out.println(s1.equals(s2));
System.out.println(s1.equals(abc));
System.out.println(s1.hashCode());
System.out.println(s2.hashCode());
System.out.println(abc.hashCode());


6. What is the output of the Program

try{
int data=25/0;
System.out.println(data);
}
catch(NullPointerException e){
System.out.println(e);
}
finally{
System.out.println("finally block is always executed");
}
System.out.println("rest of the code...");


7. And also this

public static void main(String args[]){
try{
int data=25/0;
System.out.println(data);
}

catch(ArithmeticException e){System.out.println(e);}

finally{System.out.println("finally block is always executed");}

System.out.println("rest of the code...");
}