Java Strings Test(1st)

How many objects will be created?

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

1 Mark(s)

2
4
None of this
3

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));
        }
}

1 Mark(s)

None of these
two
onetwo
twoone
one

What is the output of the following println statement?

String str1 = "Hellow";
System.out.println(str1.indexOf('t'));

1 Mark(s)

0
false
1
-1
true

How many Constructor String class have?

1 Mark(s)

2
7
11
13
None of this

String str1 = "Kolkata".replace('k', 'a');

In the above statement, the effect on string Kolkata is

1 Mark(s)

Displays error message
All characters a are replaced by k.
The first occurrence of k is replaced by a.
All characters k are replaced by a.

toString() method is defined in

1 Mark(s)

None of these
java.lang.util
java.lang.String
java.lang.Object

The String method compareTo() returns

1 Mark(s)

1
true
-1
false
an int value

What could be output of the following fragment of code?

public class Test{
        public static void main(String args[]){ 
		String x = "hellow";
		int y = 9;
		System.out.println(x += y);
        } 
}

1 Mark(s)

9hellow
Throws an exception as string and int are not compatible for addition
Compilation error
hellow9
None of these

What will be the output?

public class Test{ 
        public static void main (String[] args){ 
		String test = "a1b2c3"; 
                String[] tokens = test.split("\\d"); 
                for(String s: tokens) 
                        System.out.print(s); 
	} 
}

1 Mark(s)

Compilation error
123
abc
Runtime exception thrown

The output of the following fraction of code is

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

1 Mark(s)

Hellow
Hello
Compilation error
Throws an exception
None of these

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");
            }
      }
}

1 Mark(s)

An exception is thrown at runtime.
'1' is printed.
Compilation fails.
'2' is printed.
'3' is printed.

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

1 Mark(s)

java.string
java.applet
java.lang
java.awt

What will be the output?

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

1 Mark(s)

abc
bc
bcd
abcd
None of these

What will be the output of the following program code?

class LogicalCompare{
        public static void main(String args[]){
                String str1 = new String("OKAY");
                String str2 = new String(str1);
                System.out.println(str1 == str2);
        }
}

1 Mark(s)

1
false
true
0
Displays error message

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));
      }
}

1 Mark(s)

true,true
false,true
true,false
false,false
None of these

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. }

1 Mark(s)

An exception is thrown at runtime.
Compilation fails because of an error at line 3
Compilation fails because of an error at line 5
None of these
one.two.three.

Determine output:

public class Test{
        public static void main(String args[]){ 	
		String s1 = "SITHA";
		String s2 = "RAMA";
		System.out.println(s1.charAt(0) > s2.charAt(0));
        }
}

1 Mark(s)

true
Throws Exception
0
Compilation error
false

What will be output?

String S1 = "S1 ="+ "123"+"456";
String S2 = "S2 ="+(123+456);

1 Mark(s)

None of This
S1=579,S2=579
S1=123456,S2=123456
S1=123456, S2=579

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); 
        }
}

1 Mark(s)

true true
true false
false true
false false

Java Strings Test(1st) : Question 1 of 19