1.算术运算：java支持的算术运算包括加减乘除运算，求余运算以及自加或自减运算。
public class Div
{
public static void main (String [] args)
{
double a = 3.14;
int b = 16;
double c= a+b;
System.out.println(c);
System.out.println(a-b);
System.out.println(a*b);
System.out.println(a/b);
System.out.println(a/0.0);
System.out.println(a/0);
System.out.println(a%b);
System.out.println(a%0);
double d = a++ +2;
double e = ++a + 2;
System.out.println("d="+d+‘ ‘+"e="+e);
}
}
java并没有提供乘方和开方运算，可以通过java.lang.Math类工具来计算
public class math
{
public static void main (String [] args)
{
double a = 3.2;
double b = Math.pow(a,5);
System.out.println(b);
double c = Math.sqrt(a);
double d = Math.random();
System.out.println(d);
double e = Math.sin(a);
System.out.println(e);
}
}
负号可以用来做求负运算
public class qiufu
{
public static void main (String [] args)
{
int x = -5;
x = -x;
System.out.println(x);
}
}
原文：http://www.cnblogs.com/hefeixiaoxingyun/p/5872355.html