weixin_45846799的博客

PI类用于计算圆周率package com.xurong.ChaoShiTest;public class PI { //PI = 1 - 1/3 + 1/5 - 1/7 + 1/9 - ... public double calculate(int count) { double sum = 0; boolean positive = true; int n = 0; for (int i = 1;;i += 2) { sum = sum + (positive ? 1.

Calculator类package com.xurong.sample;import java.util.Arrays;public class Calculator { public int calculate(String expression) { if (expression == null) {//增加此判断条件，是为了满足抛出的异常是NumberFormatException异常 throw new NumberFormatException("Expression is

package com.xurong.sample;import org.junit.After;import org.junit.AfterClass;import org.junit.Before;import org.junit.BeforeClass;import org.junit.Test;public class SequenceTest { @BeforeClass public static void setUpBeforeClass() throws Exceptio

Calculator类package com.xurong.sample;import java.util.Arrays;public class Calculator { public int calculate(String expression) { String[] ss = expression.split("\\+");//以+号进行分割 System.out.println(expression + " => " + Arrays.toString(ss)); i