core java 2

what is the output of this question?

class Test1 {

public

static void main(String[] args)

{

int x = 20;

System.out.println(x);

}

static

{

int x = 10;

System.out.print(x + " ");

}

}

• 10 20

• 20 10

• 10 10

• 20 20

Predict the output of the following program.

class A{

int a=40;//non static

public static void main(String args[]){

System.out.println(a);

}

}

• Compilation Error

• 40

• 0

• None of the above

what is the output of this question?

class Test1 {

static int x = 10;

public

static void main(String[] args)

{

Test1 t1 = new Test1();

Test1 t2 = new Test1();

t1.x = 20;

System.out.print(t1.x + " ");

System.out.println(t2.x);

}

}

• 10 10

• 20 20

• 10 20

• 20 10

What is the output of this question?

class Test1 {

static int i = 1;

public static void main(String[] args)

{

for (int i = 1; i < 10; i++) {

i = i + 2;

System.out.print(i + " ");

}

}

}

• 3 6 9

• 3 6 9 …. 27

• Error

• none

What is the output of this question?

class Test1 {

static int i = 1;

public static void main(String[] args)

{

int i = 1;

for (Test1.i = 1; Test1.i < 10; Test1.i++) {

i = i + 2;

System.out.print(i + " ");

}

}

}

• 1 3 9

• 1 2 3 … 9

• 3 5 7 9 11 13 15 17 19

• None

Which one of the following is a valid statement?

• char[] c = new char();

• char[] c = new char[5];

• char[] c = new char(4);

• char[] c = new char[];

What will be the output?

public class Test

{

public static void main(String args[])

{

int[] x=new int[3];

System.out.print("x[0] is" + x[0]);

}}

• The program has a compile error because the size of the array wasn't specified when declaring the array.

• The program has a runtime error because the array elements are not initialized.

• The program runs fine and displays x[0] is 0.

• The program has a runtime error because the array element x[0] is not defined

An Array in Java is a collection of elements of ___ data type.

• Same

• Different

Which is the correct way of knowing Array Size in Java?

• int[] ary;

  ary.length()

• int[] ary;

  ary.length

• int[] ary;

  ary->length()

• int[] ary;

  ary->length

What is the output of the below Java program with arrays?

String[] colors = {"RED";"YELLOW";"WHITE"};

System.out.print(colors[2]);

• RED

• YELLOW

• WHITE

• Compiler error