Tutorials : Java by Example : Section 2 :

Operator	Explanation	Example
+	adds two numbers	1 + 2
-	subtracts two numbers	7 - 4
*	multiplies two numbers	4 * 5
/	divides two numbers	21 / 3

For illustration, see the following example:

//Sourcecode import java.awt.*; import java.applet.*; public class Project5D extends Applet { public void paint(Graphics g) { //two operators to do calculations with: int op1=12, op2=4; //we compute four numbers out of our two operators int sum=op1+op2; int diff=op1-op2; int prod=op1*op2; int quot=op1/op2; g.setFont(new Font("Helvetica",Font.PLAIN,18)); g.drawString(op1+" + "+op2+" = "+sum, 100,40); g.drawString(op1+" - "+op2+" = "+diff, 100,70); g.drawString(op1+" * "+op2+" = "+prod, 100,100); g.drawString(op1+" / "+op2+" = "+quot, 100,130); } }

A shorter and often used way to change variables, especially for incrementing and decrementing (adding or subtracting 1), can be seen in the following table:

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