Question

创建map集合，创建Emp对象001，张三；002，李四，遍历集合

Answer 1

import java.util.*;
import java.util.Map.Entry;

public class HelloWorld {
public static void main(String[] args) {
Map<Integer, Stu> stuMap = new HashMap<Integer, Stu>();
stuMap.put(1, new Stu("张三"));
stuMap.put(2, new Stu("李四"));
Iterator<Entry<Integer, Stu>> it = stuMap.entrySet().iterator();
while (it.hasNext())
System.out.println(it.next());
// or
Set<Integer> set = stuMap.keySet();
for (Integer integer : set) {
System.out.println(integer + ", " + stuMap.get(integer).getName());
}
}
}

class Stu {

@Override
public String toString() {
return this.name;
}

private String name;

public Stu() {
}

public Stu(String name) {
this.name = name;
}

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

}