初始化

.gitignore

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+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store

pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>com.icecream</groupId>
+    <artifactId>zgl-rikao-day18-8-7</artifactId>
+    <version>1.0-SNAPSHOT</version>
+
+    <properties>
+        <maven.compiler.source>8</maven.compiler.source>
+        <maven.compiler.target>8</maven.compiler.target>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    </properties>
+
+</project>

src/main/java/com/bwie/test/Test.java

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+package com.bwie.test;
+
+
+import com.sun.xml.internal.ws.api.model.wsdl.WSDLOutput;
+
+import java.math.BigDecimal;
+import java.math.RoundingMode;
+
+public class Test {
+
+
+    public static void main(String[] args) {
+        BigDecimal num1 = new BigDecimal("10.00");
+        BigDecimal num2 = new BigDecimal("20.00");
+
+
+        System.out.println("num1+num2=" + num1.add(num2));
+        System.out.println("num1-num2="+num1.subtract(num2));
+        System.out.println("num1*num2="+num1.multiply(new BigDecimal("3")));
+        System.out.println("num1/num2="+num2.divide(num1, 2, RoundingMode.HALF_UP));
+    }
+
+
+}