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Java ArrayList foreach

Submitted by Megha on Thu, 11/11/2010 - 17:46
2
Your rating: None Average: 2 (1 vote)
This small Java example shows how to traverse Java ArrayList using foreach loop.
  1. import java.util.ArrayList;
  2.  
  3. //Java ArrayList foreach
  4. public class ArrayListForEachExample {
  5.  
  6.     public static void main(String args[]){
  7.        
  8.         //create new ArrayList
  9.         ArrayList<String> aListColors = new ArrayList<String>();
  10.         aListColors.add("Red");
  11.      
»
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Java ArrayList Clone

Submitted by Megha on Thu, 11/11/2010 - 17:19
4
Your rating: None Average: 4 (3 votes)
This Java ArrayList clone example shows how to clone Java ArrayList object.
  1. import java.util.ArrayList;
  2. import java.util.Iterator;
  3.  
  4. //Java clone ArrayList example
  5.  
  6. public class JavaCloneArrayListExample {
  7.    
  8.     public static void main(String args[]){
  9.        
  10.         //create original ArrayList object
  11.         ArrayList<Employee> aListOriginal = new ArrayList<Employee&g
»
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What will happen when you compile and run the following code?

Submitted by Megha on Sat, 09/04/2010 - 18:24
3.5
Your rating: None Average: 3.5 (2 votes)
  1. public class BooleanDemo {
  2.     public static void main(String args[]){
  3.         Boolean bObj = new Boolean("Hello World!");
  4.         System.out.println(bObj);
  5.     }
  6. }
a. Program will not compile
b. Program will throw runtime error
c. Program will print false
d. Program will print true

Answer:
»
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What will be output on compiling and running the following code?

Submitted by Megha on Sat, 09/04/2010 - 18:06
0
Your rating: None
  1. public class DemoThread extends Thread{
  2.    
  3.     public void run(String msg){
  4.         System.out.println("Thread Started: " + msg);
  5.     }
  6.    
  7.     public static void main(String args[]){
  8.         DemoThread thread = new DemoThread();
  9.         thread.start();
  10.     }    
  11. }
a. Program will not compile
b. Program will compile, but will not run.
»
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SCJP True False Question Set 1

Submitted by Megha on Fri, 09/03/2010 - 23:47
5
Your rating: None Average: 5 (1 vote)
Q.1 Will this statement compile?

  int i= 1 + '1';

  a. true
b. false


  Q.2 java.util.Set maintains key value pair.
  a. True
b. False
»
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Which of the following statements are true about a static variable?

Submitted by Megha on Fri, 09/03/2010 - 23:41
0
Your rating: None
a. Static variable retain its value between method calls.
b. Value of static variable can’t be changed once assigned.
c. Variable can’t be static, only method can be.
d. Only one static variable is shared among all objects of the class.
»
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Given the following classes, which of the following statements will compile without error?

Submitted by Megha on Fri, 09/03/2010 - 23:40
0
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  1. interface myInterface{}
  2. class another implements myInterface{}
  3. class Hello{}
  4.  
  5. public class HelloWorld extends Hello{
  6.  
  7.  public static void main(String argv[]){
  8.  
  9.   HelloWorld hw= new HelloWorld();
  10.   Hello h = new Hello();
  11.   Object obj = new Object();
  12.   myInterface mi = new another();
  13.  
  14.      }
  15. }
a. obj = mi;
b. mi=obj;
c. h=hw;
d. hw=h;
»
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What will happen when you attempt to compile and run the following code?

Submitted by Megha on Fri, 09/03/2010 - 23:39
0
Your rating: None
  1. public class Demo
  2. {
  3.    int myInt = 1;
  4.    public static void main(String argv[])
  5.    {
  6.        int myInt;
  7.        System.out.println(myInt);
  8.    }
  9. }
a. 1 as output
b. 0 as output
c. Compile time error
d. Run time error
»
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What will happen when you attempt to compile and run the following code?

Submitted by Megha on Fri, 09/03/2010 - 23:38
0
Your rating: None
  1. public class Demo
  2. {
  3.    public static void main(String args[])
  4.    {
  5.        Long lng = new Long(113);
  6.        System.out.println(lng);
  7.    }
  8. }
a. Compilation error
b. No compilation error but will throw runtime exception when executed.
c. 113
d. None of the above
»
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What will be the output, when the following code is executed?

Submitted by Megha on Fri, 09/03/2010 - 23:36
0
Your rating: None
  1. public class Demo
  2. {
  3.    public static void main(String args[])
  4.    {
  5.        outer: for(int i = 0; i < 5; ++i)
  6.            inner: for(int j = 0; j < 5; ++j)
  7.            {
  8.                if(j==0)
  9.                break inner;
  10.                System.out.println("j is " + j);
  11.            }
  12.    }
  13. }
a. j is 0
b. j is 3
c. j is 1
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