How many main types of errors occur in Java?

Which of these can be used when a class will be fully abstract?

Predict the output of the following Java code.

Which of these method of FileReader class is used to read characters from a file?

class demo{

 public static void main(String args[]){

  String first = "Spencer";

  first.concat("Gold");

  System.out.println(first); 

 }

}

public class check{

public static void main(String args[]){

int a=10;

int b=20;

int c=10;

int output=0;

output=++a + ++b + ++c ;

System.out.println(output);

}

}

Which of the following is the best practice to measure the time taken by a process for execution?

Which of the following is true about inheritance in Java?

1) Private methods are final.

2) Protected members are accessible within a package and 

  inherited classes outside the package.

3) Protected methods are final.

4) We cannot override private methods. 

Insert the code to make a loop infinite.

class Abekus {

public static void main(String[] args) {

/*write code here*/

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

}

}

}

What will be the output of the program?

try
{
int x = 0;
int y = 5 / x;
}
catch (ArithmeticException ae)
{
System.out.println("Arithmetic Exception");
}
catch (Exception e)
{
System.out.println("Exception");
}
System.out.println("finished");