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Java
import java.util.Iterator;
import java.util.Set;
import java.util.TreeMap;

public class Example19 {
    public static void main(String[] args) {
        TreeMap map = new TreeMap(); // 創(chuàng)建Map集合
        map.put(2. "趙六"); // 存儲鍵和值
        map.put(1. "張三");
        map.put(3. "王五");
        map.put(2. "李四");
        Set keySet = map.keySet();
        Iterator it = keySet.iterator();
        while (it.hasNext()) {
            Object key = it.next();
            Object value = map.get(key); // 獲取每個(gè)鍵所對應(yīng)的值
            System.out.println(key + ":" + value);
        }
    }
}

Java
import java.util.Comparator;
import java.util.Iterator;
import java.util.Set;
import java.util.TreeMap;

class Student {
    private String name;
    private int age;

    public Student(String name, int age) {
        this.name = name;
        this.age = age;
    }

    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }

    @Override
    public String toString() {
        return "Student [name=" + name + ", age=" + age + "]";
    }
}

public class Example20 {
    public static void main(String[] args) {
        TreeMap tm = new TreeMap(new Comparator<Student>() {
            @Override
            public int compare(Student s1. Student s2) {
                int num = s1.getName().compareTo(s2.getName()); // 按照姓名比較
                return num == 0 ? num : s1.getAge() - s2.getAge();
            }
        });
        tm.put(new Student("張三", 23), "北京");
        tm.put(new Student("李四", 13), "上海");
        tm.put(new Student("趙六", 43), "深圳");
        tm.put(new Student("王五", 33), "廣州");
        Set keySet = tm.keySet();
        Iterator it = keySet.iterator();
        while (it.hasNext()) {
            Object key = it.next();
            Object value = tm.get(key); // 獲取每個(gè)鍵所對應(yīng)的值
            System.out.println(key + ":" + value);
        }
    }
}