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.example</groupId>
+    <artifactId>rikao18</artifactId>
+    <version>1.0-SNAPSHOT</version>
+
+    <properties>
+        <maven.compiler.source>17</maven.compiler.source>
+        <maven.compiler.target>17</maven.compiler.target>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    </properties>
+
+</project>

src/main/java/com/example/BigDecimalApplication.java

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+package com.example;
+
+import java.math.BigDecimal;
+
+public class BigDecimalApplication {
+    public static void main(String[] args) {
+
+        // 设置编码（仅在需要时启用）
+        try {
+            System.setOut(new java.io.PrintStream(System.out,true,"UTF-8"));
+        } catch (java.io.UnsupportedEncodingException e) {
+            System.err.println("无法设置UTF-8编码：" + e.getMessage());
+        }
+
+        //创建两个BigDecimal对象
+        BigDecimal num1 = new BigDecimal("99.52");
+        BigDecimal num2 = new BigDecimal("77.52");
+
+        //加法计算
+        BigDecimal result = num1.add(num2);
+        System.out.println("加法计算结果：" + result);
+
+        //减法计算
+        result = num1.subtract(num2);
+        System.out.println("减法计算结果：" + result);
+
+        //乘法计算
+        result = num1.multiply(num2);
+        System.out.println("乘法计算结果：" + result);
+
+        //除法计算
+        //默认保留小数点后两位
+        result = num1.divide(num2, 2, BigDecimal.ROUND_HALF_UP);
+        System.out.println("除法计算结果：" + result);
+
+    }
+}