Java always support the call by value

 Java system properties can be set at runtime 

What will be the output of the following Java code?

In java servlet method init() is called how many times

What is the data type used for thread priority in Java?

use of Trim in java

What is a Collection in Java?

Which one is a valid declaration of a boolean?

What will be the output of the following Java program?

class Output

{

public static void main(String[] args)

{

StringBuffer c = new StringBuffer("Hello");

StringBuffer c1 = new StringBuffer(" World");

c.append(c1);

System.out.println(c);

}

}

Which of the following is true about private constructor?