DoubleInfinityDemo max min_78.7865-优快云博客

本文探讨了Java中浮点数的最大值、最小值、无穷大及NaN的表示方式，并通过实例展示了如何处理这些特殊值。同时，文章还讨论了整型溢出的情况以及除以零等异常操作。

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package double_demo;

/**
 * 无穷值、最大、最小
 *
 * @author ZengWenFeng
 * @date 
 */
public class DoubleInfinityDemo
{
	public static void main(String[] args)
	{
		float f = Float.MAX_VALUE + 1;
		System.out.println(f);//3.4028235E38
		
		
		int i = Integer.MAX_VALUE + 1;//
		System.out.println(i);//-2147483648
		int i01 = Integer.MIN_VALUE - 1;
		System.out.println(i01);//2147483647
		//-2147483648  ~ 2147483647
		
		//------------------------------------------------------------
		float f_test_1 = 78.78652988F;
		System.out.println(f_test_1);//78.78653

		float f_test_2 = 78.78652123F;
		System.out.println(f_test_2);//78.78652
		//------------------------------------------------------------

		//------------------------------------------------------------
		float f_test_3 = 78.78655678F;
		System.out.println(f_test_3);//78.78656

		float f_test_4 = 78.78655345F;
		System.out.println(f_test_4);//78.78655
		//------------------------------------------------------------

		//------------------------------------------------------------
		float f_test_5 = 78.78656F;
		System.out.println(f_test_5);//78.78656

		float f_test_6 = 78.78655F;
		System.out.println(f_test_6);//78.78655
		
		float f_test_7 = 78.7865F;
		System.out.println(f_test_7);//78.7865
		//------------------------------------------------------------

		//------------------------------------------------------------
		double d01 = Double.NEGATIVE_INFINITY;
		double d02 = Double.NEGATIVE_INFINITY;
		System.out.println(d01 == d02);//true
		//------------------------------------------------------------

		//------------------------------------------------------------
		double double_zero = 0.0;
		System.out.println(double_zero / double_zero);//NaN
		System.out.println(7.0 / double_zero);//Infinity
		System.out.println(7 / double_zero);//Infinity
		System.out.println(-7 / double_zero);//-Infinity
		System.out.println(-7.0 / double_zero);//-Infinity
		//------------------------------------------------------------

		//------------------------------------------------------------
		System.out.println("--------------NaN--------------");
		double nan = Double.NaN;
		double dd = double_zero / double_zero;

		System.out.println(nan);//NaN
		System.out.println(dd);//NaN
		System.out.println(nan == dd);//false

		System.out.println(double_zero == Float.NaN);//false
		System.out.println("--------------NaN--------------");
		//------------------------------------------------------------

		//
		System.out.println(-10 / double_zero);//-Infinity

		//------------------------------------------------------------
		//java.lang.ArithmeticException: / by zero
		//		at double_demo.JavaLesson5.main(JavaLesson5.java:32)
		//		System.out.println(0 / 0);
		//------------------------------------------------------------

		//------------------------------------------------------------
		System.out.println(0.0 / 0.0);//NaN
		//------------------------------------------------------------

		//------------------------------------------------------------
		double d600 = 600.0;
		double d900 = 900.0;

		if ((d900 / double_zero) > (d600 / double_zero))
		{
			System.out.println("900.0/0.0  > 600.0/0.0");
		}
		else if ((d900 / double_zero) == (d600 / double_zero))//equals
		{
			System.out.println("900.0/0.0  == 600.0/0.0");
		}
		else if ((d900 / double_zero) < (d600 / double_zero))
		{
			System.out.println("900.0/0.0  < 600.0/0.0");
		}
		else
		{
			System.out.println("900.0/0.0  ????? 600.0/0.0");
		}
		//900.0/0.0  == 600.0/0.0
		//------------------------------------------------------------
	}
}