=================Student类==============
懒汉式：
package com.zx.cn;
public class Student {
private Student(){
}
private static Student s = null;
public synchronized static Student getStudent(){
if(s == null){
s = new Student();
}
return s;
}
}
=============测试类==============
package com.zx.cn;
public class StudentDame {
public static void main(String[] args) {
Student s1 = Student.getStudent();
Student s2 = Student.getStudent();
System.out.println(s1 == s2);
System.out.println(s1);
System.out.println(s2);
}
}
=======================Student类===============
饿汉式
package com.zx.cn;
public class Student {
private Student(){
}
private static Student s = new Student();
public static Student getStudent(){
return s;
}
}
================测试类============
package com.zx.cn;
public class StudentDame {
public static void main(String[] args) {
Student s1 = Student.getStudent();
Student s2 = Student.getStudent();
System.out.println(s1 == s2);
System.out.println(s1);
System.out.println(s2);
}
}
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