日考7

.gitignore

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+### IntelliJ IDEA ###
+out/
+!**/src/main/**/out/
+!**/src/test/**/out/
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+bin/
+!**/src/main/**/bin/
+!**/src/test/**/bin/
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store

rik07.iml

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+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>

src/Main.java

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+import domain.Student;
+
+import java.util.HashMap;
+import java.util.Iterator;
+import java.util.Map;
+import java.util.Set;
+
+public class Main {
+    public static void main(String[] args) {
+        Student stu1 = new Student(1, "牛武", 12, 12.0);
+        Student stu2 = new Student(2, "牛六", 12, 12.0);
+
+        HashMap<Integer, Student> map = new HashMap<>();
+
+        map.put(stu1.getId(), stu1);
+        map.put(stu2.getId(), stu2);
+        System.out.println("第一种遍历方式:entrySet");
+        for (Map.Entry<Integer, Student> entry : map.entrySet()) {
+            System.out.println("键：" + entry.getKey() + "-->值：" + entry.getValue().toString());
+        }
+
+        System.out.println("第二种遍历方式：keySet + for循环遍历");
+        Set<Integer> set = map.keySet();
+        for (Integer i : set) {
+            System.out.println("键：" + i + "-->值：" + map.get(i).toString());
+        }
+
+        System.out.println("第三种遍历方式：keySet + iterator");
+        Set<Integer> set1 = map.keySet();
+        Iterator<Integer> iterator = set1.iterator();
+        while (iterator.hasNext()) {
+            Integer key = iterator.next();
+            System.out.println("键：" + key + "-->值：" + map.get(key).toString());
+        }
+
+
+    }
+}

src/domain/Student.java

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+package domain;
+
+/**
+ * @Author: WangXin
+ * @date: 2024/7/25
+ * @Description:
+ * @Version 1.0.0
+ */
+
+public class Student {
+
+    private Integer id;
+    private String name;
+    private Integer age;
+    private Double score;
+
+    public Student() {
+    }
+
+    public Student(Integer id, String name, Integer age, Double score) {
+        this.id = id;
+        this.name = name;
+        this.age = age;
+        this.score = score;
+    }
+
+    public Integer getId() {
+        return id;
+    }
+
+    public void setId(Integer id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public Integer getAge() {
+        return age;
+    }
+
+    public void setAge(Integer age) {
+        this.age = age;
+    }
+
+    public Double getScore() {
+        return score;
+    }
+
+    public void setScore(Double score) {
+        this.score = score;
+    }
+
+    @Override
+    public String toString() {
+        final StringBuilder sb = new StringBuilder("Student{");
+        sb.append("id=").append(id);
+        sb.append(", name='").append(name).append('\'');
+        sb.append(", age=").append(age);
+        sb.append(", score=").append(score);
+        sb.append('}');
+        return sb.toString();
+    }
+}