Write a program in Java that reads a word and checks whether it begins with a vowel or not.

Find the errors in the following code and rewrite the correct version:

char m="A";
Switch ("A");
{
 Case 'a';
     System.out.println("A");
     break;
 Case 'b';
     System.out.println("B");
     break;
 Default:
     System.out.println("Not a valid option");
}

What will be the output of the following code?

int x=2,y=5,a=0;
a=x; 
x=y; 
y=a; 
System.out.println("x=" + x + " 
y=" + 
y);

Create a program to find out if the number entered by the user is a two, three or four digits number.

Sample input: 1023
Sample output: 1023 is a 4 digit number.