Java Tutorial

Programming Basics

System.out.println ("");

This statement is used for displaying the data or messages on to the consol (monitor).

Here, println is the predefined instance method of print stream class.

To call this method we require an object called print stream class.

The object of print stream class is called out is created as a static data member in system class (system is a predefined class).

Hence to call the println method we must use the following statement:

System.out.println ("WELCOME TO JAVA");

Print stream class is a predefined class which contains nine overloaded instance println methods and nine overloaded instance print methods and whose prototypes are as follows:

Public void println (byte);
Public void println (short);
Public void println (int);
Public void println (long);
Public void println (float);
Public void println (double);
Public void println (char);
Public void println (Boolean);
Public void println (string);

Public void print (byte);
Public void print (short);
Public void print (int);
Public void print (long);
Public void print (float);
Public void print (double);
Public void print (char);
Public void print (Boolean);
Public void print (string);

For example:

Int a=40000;
System.out.println (a);	//40000
System.out.println ("value of a=" + a); //value of a=40000
System.out.println (a + "is the value of a"); //40000 is the value of a

For example:

Int a=10, b=20, c; 
C = a + b;
System.out.println (c); //30
System.out.println ("sum=" + c); //sum=30
System.out.println (c + "is the sum"); // 30 is the sum
System.out.println ("sum of" + a + "and" + b + "=" + c); //sum of 10 and 20 is 30