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Copy pathHashMapTest.java
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55 lines (44 loc) · 1.22 KB
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package java_base;
import java.util.HashMap;
class Student{
private int sno = 0;
private String name;
private double score;
public Student() {
// TODO Auto-generated constructor stub
}
public Student(int sno, String name, double score) {
// TODO Auto-generated constructor stub
super();
this.sno = sno;
this.name = name;
this.score = score;
}
@Override
public String toString() {
// TODO Auto-generated method stub
return "S[" + sno + ","+ name + "," + score + "]";
}
}
public class HashMapTest {
public static void main(String[] args) {
HashMap<Integer, Student> hh = new HashMap<Integer, Student>();
hh.put(199901, new Student(199901, "java", 98));
hh.put(199902, new Student(199902, "ZhangSan", 98));
hh.put(199903, new Student(199903, "LiSi", 98));
hh.put(199904, new Student(199904, "WnagWu", 98));
hh.put(199905, new Student(199905, "Zhengliu", 98));
hh.put(199906, new Student(199906, "XiaoMing", 98));
System.out.println(hh.size());
System.out.println(hh.get(199906));
for(int key1: hh.keySet())
{
System.out.println(key1 + ":" + hh.get(key1));
}
}
}
/**
* 字典的定义 hashmap<xx,xx>
* 字典dict的历遍方式
* for(int key1: hh.keyset()) 思路是将二维转化成一维；
*/