Question 1

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

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

Question 2

What will be the output of the following program code? <pre class="prettyprint"> 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)); } } </pre>

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

Question 3

What will be the output of the following program? <pre class="prettyprint"> 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); } } </pre>

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

Question 4

How many objects will be created? <pre class="prettyprint"> String a = new String("Atnylagk"); String b = new String("Atnylagk"); String c = "Atnylagk"; String d = "Atnylagk"; </pre>

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

Question 5

Determine output: <pre class="prettyprint"> 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"); } } } </pre>

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

Question 6

What will be the output? <pre class="prettyprint"> 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); } } </pre>

A. abc B. 123 C. Runtime exception thrown D. Compilation error

Question 7

What will be the output? <pre class="prettyprint"> String str1 = "abcde"; System.out.println(str1.substring(1, 3)); </pre>

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

Question 8

The String method compareTo() returns

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

Question 9

What will be the output? <pre class="prettyprint"> 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. } </pre>

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.

Question 10

What will be output? <pre class="prettyprint"> String S1 = "S1 ="+ "123"+"456"; String S2 = "S2 ="+(123+456); </pre>

A. S1=123456, S2=579 B. S1=123456,S2=123456 C. S1=579,S2=579 D. None of This

String in Java