哈希表与散列函数

package demo13;

public class StuInfo {

	private int age;
	private int count;

	public int getAge() {
		return age;
	}

	public void setAge(int age) {
		this.age = age;
	}

	public int getCount() {
		return count;
	}

	public void setCount(int count) {
		this.count = count;
	}
	
	/**
	 * 散列函数
	 */
	public int hashCode() {
		return age;
	}

	public StuInfo(int age, int count) {
		super();
		this.age = age;
		this.count = count;
	}

	public StuInfo(int age) {
		super();
		this.age = age;
	}

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

}

package demo13;

import java.util.Arrays;

public class HashTable {
	private StuInfo[] data = new StuInfo[100];
	
	/**
	 * 向散列表中添加元素
	 * @param stuInfo
	 */
	public void put(StuInfo stuInfo) {
		//调用散列函数获取存储位置
		int index = stuInfo.hashCode();
		//添加元素
		data[index]=stuInfo;
	}
	
	public StuInfo get(StuInfo stuInfo) {
		return data[stuInfo.hashCode()];
	}

	@Override
	public String toString() {
		return "HashTable [data=" + Arrays.toString(data) + "]";
	}
	
	

}

package demo13;

import java.util.Arrays;

public class TestHashTable {

	public static void main(String[] args) {
		StuInfo s1 = new StuInfo(16, 3);
		StuInfo s2 = new StuInfo(17, 11);
		StuInfo s3 = new StuInfo(18, 23);
		StuInfo s4 = new StuInfo(19, 24);
		StuInfo s5 = new StuInfo(20, 9);
		
		HashTable ht = new HashTable();
		ht.put(s1);
		ht.put(s2);
		ht.put(s3);
		ht.put(s4);
		ht.put(s5);

		System.out.println(ht);
		
		//想要获取的目标数据
		StuInfo target = new StuInfo(18);
		StuInfo info = ht.get(target);
		System.out.println(info);
		
	}
	
}