Java类BigDecimal（1）

package com.ylchou.testBigDecimal;

import java.math.BigDecimal;

public class TestBigDecimal {
	public static void main(String[] args) {
		System.out.println(0.08+0.07);
		System.out.println(0.08-0.07);
		System.out.println(0.08*0.07);
		System.out.println(0.08/0.07);
//		System.out.println(0.05-0.02);
//		System.out.println(1.15*100);
//		System.out.println(123.3/100);
		System.out.println("--------------------------------------------");
		
		BigDecimal d1 = new BigDecimal(0.08);
		BigDecimal d2 = new BigDecimal(0.07);
		System.out.println(d1.add(d2));
		System.out.println(d1.subtract(d2));
		System.out.println(d1.multiply(d2));
//		System.out.println(d1.divide(d2));//异常
		System.out.println(d1.divide(d2,10,BigDecimal.ROUND_HALF_UP));
		System.out.println("--------------------------------------------");
		
		BigDecimal d11 = new BigDecimal("0.08");
		BigDecimal d22 = new BigDecimal("0.07");
		System.out.println(d11.add(d22));
		System.out.println(d11.subtract(d22));
		System.out.println(d11.multiply(d22));
//		System.out.println(d11.divide(d22));//异常
		System.out.println(d11.divide(d22,10,BigDecimal.ROUND_HALF_UP));
		System.out.println("--------------------------------------------");
		
		BigDecimal d111 = BigDecimal.valueOf(0.08);
		BigDecimal d222 = BigDecimal.valueOf(0.07);
		System.out.println(d111.add(d222));
		System.out.println(d111.subtract(d222));
		System.out.println(d111.multiply(d222));
//		System.out.println(d111.divide(d222));//异常 
		System.out.println(d111.divide(d222,10,BigDecimal.ROUND_HALF_UP));
		System.out.println("--------------------------------------------");
	}
}

控制台输出：

0.15000000000000002
0.009999999999999995
0.005600000000000001
1.1428571428571428
--------------------------------------------
0.15000000000000000832667268468867405317723751068115234375
0.00999999999999999500399638918679556809365749359130859375
0.00560000000000000064948046940571658724118100550360839641493294928918135477946549372063600458204746246337890625
1.1428571429
--------------------------------------------
0.15
0.01
0.0056
1.1428571429
--------------------------------------------
0.15
0.01
0.0056
1.1428571429
--------------------------------------------

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