String in Java - Quiz

Q: What will be the output of the following program?

public class Test{
        public static void main(String args[]){
		String s1 = "java";
		String s2 = "java";
		System.out.println(s1.equals(s2));
		System.out.println(s1 == s2); 
        }
}

A. false true
B. false false
C. true false
D. true true

Correct Option: D
Explanation: true true

Q: What will be the output?

String str1 = "abcde";
System.out.println(str1.substring(1, 3));

A. abc
B. bc
C. bcd
D. abcd

Correct Option: B
Explanation: bc

Q: What will be the output of the following program code?

public class Test{
      public static void main(String args[]){
            String s = "what";
            StringBuffer sb = new StringBuffer("what");
            System.out.print(sb.equals(s)+","+s.equals(sb));
      }
}

A. true,true
B. false,true
C. true,false
D. false,false

Correct Option: D
Explanation: false,false

Q: How many objects will be created?

String a = new String("Atnylagk");
String b = new String("Atnylagk");
String c = "Atnylagk";
String d = "Atnylagk";

A. 4
B. 3
C. 2
D. None of this

Correct Option: C
Explanation: 3

Q: What will be the output?

1. public class Test{
2.      public static void main(String args[]){
3.            Object myObj = new String[]{"one", "two", "three"};
4.            {
5.	          for(String s : (String[])myObj) 
6.		        System.out.print(s + ".");
7.	    }
8.      }
9. }

A. one.two.three.
B. Compilation fails because of an error at line 3
C. Compilation fails because of an error at line 5
D. An exception is thrown at runtime.

Correct Option: A
Explanation: one.two.three.

Q: What will be the output of the following program?

public class Test{
        public static void main(String args[]){
		String str1 = "one";
		String str2 = "two";
		System.out.println(str1.concat(str2));
        }
}

A. one
B. two
C. onetwo
D. twoone

Correct Option: C
Explanation: onetwo

Q: The String method compareTo() returns

A. true
B. false
C. an int value
D. 1

Correct Option: C
Explanation: an int value

Q: toString() method is defined in

A. java.lang.String
B. java.lang.Object
C. java.lang.util
D. None of these

Correct Option: B
Explanation: java.lang.Object

Q: Determine output:

public class Test{
      public static void main(String args[]){
            String str = null;
            if(str.length() == 0){
                  System.out.print("1");
            }
            else if(str == null){
                  System.out.print("2");
            }
            else{
                  System.out.print("3");
            }
      }
}

A. Compilation fails.
B. "1" is printed.
C. "2" is printed.
D. An exception is thrown at runtime.

Correct Option: D
Explanation: An exception is thrown at runtime.

Q: The class string belongs to ................. package.

A. java.awt
B. java.lang
C. java.applet
D. java.string

Correct Option: B
Explanation: java.lang

String in Java - Quiz

What will be the output of the following program?
public class Test{ public static void main(String args[]){ String s1 = "java"; String s2 = "java"; System.out.println(s1.equals(s2)); System.out.println(s1 == s2); } }

What will be the output?
String str1 = "abcde"; System.out.println(str1.substring(1, 3));

What will be the output of the following program code?
public class Test{ public static void main(String args[]){ String s = "what"; StringBuffer sb = new StringBuffer("what"); System.out.print(sb.equals(s)+","+s.equals(sb)); } }

How many objects will be created?
String a = new String("Atnylagk"); String b = new String("Atnylagk"); String c = "Atnylagk"; String d = "Atnylagk";

What will be the output?
1. public class Test{ 2. public static void main(String args[]){ 3. Object myObj = new String[]{"one", "two", "three"}; 4. { 5. for(String s : (String[])myObj) 6. System.out.print(s + "."); 7. } 8. } 9. }

What will be the output of the following program?
public class Test{ public static void main(String args[]){ String str1 = "one"; String str2 = "two"; System.out.println(str1.concat(str2)); } }

The String method compareTo() returns

toString() method is defined in

Determine output:
public class Test{ public static void main(String args[]){ String str = null; if(str.length() == 0){ System.out.print("1"); } else if(str == null){ System.out.print("2"); } else{ System.out.print("3"); } } }

The class string belongs to ................. package.

String in Java - Quiz

What will be the output of the following program? public class Test{ public static void main(String args[]){ String s1 = "java"; String s2 = "java"; System.out.println(s1.equals(s2)); System.out.println(s1 == s2); } }

What will be the output? String str1 = "abcde"; System.out.println(str1.substring(1, 3));

What will be the output of the following program code? public class Test{ public static void main(String args[]){ String s = "what"; StringBuffer sb = new StringBuffer("what"); System.out.print(sb.equals(s)+","+s.equals(sb)); } }

How many objects will be created? String a = new String("Atnylagk"); String b = new String("Atnylagk"); String c = "Atnylagk"; String d = "Atnylagk";

What will be the output? 1. public class Test{ 2. public static void main(String args[]){ 3. Object myObj = new String[]{"one", "two", "three"}; 4. { 5. for(String s : (String[])myObj) 6. System.out.print(s + "."); 7. } 8. } 9. }

What will be the output of the following program? public class Test{ public static void main(String args[]){ String str1 = "one"; String str2 = "two"; System.out.println(str1.concat(str2)); } }

The String method compareTo() returns

toString() method is defined in

Determine output: public class Test{ public static void main(String args[]){ String str = null; if(str.length() == 0){ System.out.print("1"); } else if(str == null){ System.out.print("2"); } else{ System.out.print("3"); } } }

The class string belongs to ................. package.

What will be the output of the following program?
public class Test{ public static void main(String args[]){ String s1 = "java"; String s2 = "java"; System.out.println(s1.equals(s2)); System.out.println(s1 == s2); } }

What will be the output?
String str1 = "abcde"; System.out.println(str1.substring(1, 3));

What will be the output of the following program code?
public class Test{ public static void main(String args[]){ String s = "what"; StringBuffer sb = new StringBuffer("what"); System.out.print(sb.equals(s)+","+s.equals(sb)); } }

How many objects will be created?
String a = new String("Atnylagk"); String b = new String("Atnylagk"); String c = "Atnylagk"; String d = "Atnylagk";

What will be the output?
1. public class Test{ 2. public static void main(String args[]){ 3. Object myObj = new String[]{"one", "two", "three"}; 4. { 5. for(String s : (String[])myObj) 6. System.out.print(s + "."); 7. } 8. } 9. }

What will be the output of the following program?
public class Test{ public static void main(String args[]){ String str1 = "one"; String str2 = "two"; System.out.println(str1.concat(str2)); } }

Determine output:
public class Test{ public static void main(String args[]){ String str = null; if(str.length() == 0){ System.out.print("1"); } else if(str == null){ System.out.print("2"); } else{ System.out.print("3"); } } }