testfloat.java

疯狂Java讲义_源码(含Java设计模式CHM

/**
 * Description:
 * <br/>Copyright (C), 2005-2008, Yeeku.H.Lee
 * <br/>This program is protected by copyright laws.
 * <br/>Program Name:
 * <br/>Date:
 * @author  Yeeku.H.Lee [e-mail]
 * @version  1.0
 */
public class TestFloat
{
	public static void main(String[] args) 
	{
		float af = 5.2345556f;
		//下面将看到af的值已经发生了改变
		System.out.println(af);
		double a = 0.0;
		double c = Double.NEGATIVE_INFINITY;
		float d = Float.NEGATIVE_INFINITY;
		//看到float和double的负无穷大的是相等的。
		System.out.println(c == d);
		//0.0除以0.0将出现非数
		System.out.println(a / a);
		//两个非数之间是不相等的
		System.out.println(a / a == Float.NaN);
		//所有正无穷大都是相等的
		System.out.println(6.0 / 0 == 555.0/0);
		//负数除以0.0得到负无穷大
		System.out.println(-8 / a);
		//下面代码将抛出除以0的异常
		//System.out.println(0 / 0);
	}
}