Modulo Operations: x % y = x - ((int) (x/y)*y). : Arithmatic Operators « Operators « SCJP

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SCJP » Operators » Arithmatic Operators 
2.5.10.Modulo Operations: x % y = x - ((int) (x/y)*y).
% modulo operator yields the remainder from an implied division of the left operand (dividend) by the right operand (divisor). 

The result will be negative only if the dividend is negative. 
Note that if the operands are integers, the ArithmeticException can be thrown if the divisor is zero.

public class MainClass{
    public static void main(String[] argv){
        System.out.println(7%2);
    }
}
 
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2.5.Arithmatic Operators
2.5.1.Arithmetic Operator Summary
2.5.2.The * and / operators perform multiplication and division on all primitive numeric types and char.
2.5.3.Integer division will generate an ArithmeticException when attempting to divide by zero.
2.5.4.Multiply can cause overflow.
2.5.5.Divide can cause underflow.
2.5.6.Integer Division and Division by Zero
2.5.7.Division of an integer by zero results in the throwing of an ArithmeticException.
2.5.8.A positive floating-point value / zero results = POSITIVE_INFINITY.
2.5.9.A negative floating point value / zero = NEGATIVE_INFINITY.
2.5.10.Modulo Operations: x % y = x - ((int) (x/y)*y).
2.5.11.Java allows floating-point operands to be used with the % operator.
2.5.12.The Modulo Operator % gives the remainder of a division.
2.5.13.Apply Modulo Operator % to floating-point numbers
2.5.14.Apply Modulo Operator % to negative numbers
2.5.15.Apply Modulo Operator %, what if the second operand is 0
2.5.16.Overflow and Underflow
2.5.17.+ operator is overloaded by the Java language for String
2.5.18.Number types get converted when plusing to a string
2.5.19.Conversion to a String object is performed by invoking the toString() method of that object.
2.5.20.String concatenation gets interesting when you combine numbers with Strings
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