設計模式案例--單例模式--餓漢式單例模式(hunger singleton)

餓漢式單例模式(hunger singleton)

單例類文件StudentSingleton.java

package com.dou361.singleton;

/**
 * @author Admin
 *餓漢單例模式
 */
public class StudentSingleton {
	
	//已經自行實例化 
	private static StudentSingleton studentSingleton = new StudentSingleton();

	//私有的默認構造
	private StudentSingleton() {}
	
	//靜態工廠方法 
	public static final StudentSingleton getInstance() {
		return studentSingleton;
	}
	
	public void getName() {
		System.out.println("我是一個單例小案例");
	}
	
	public void getGender() {
		System.out.println("我是爺們");
	}
	
}

測試類文件Test.java

package com.dou361.test;

import com.dou361.singleton.StudentSingleton;


public class Test {
	public static void main(String[] args) {
		StudentSingleton studentSingleton = StudentSingleton.getInstance();
		studentSingleton.getName();
		studentSingleton.getGender();
		
		StudentSingleton student = StudentSingleton.getInstance();
		student.getName();
		student.getGender();
		
		//判斷是否是單例
		System.out.println(studentSingleton.equals(studentSingleton));
	}
}