单例设计模式

/**
 * 标准的饿汉式单例设计模式
 */
public enum DemoTest {
    DEMO_TEST("a","b");

    private String name;
    private String age;

    public String getName() {
        return name;
    }

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

    public String getAge() {
        return age;
    }

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

    DemoTest(String name, String age) {
        this.name = name;
        this.age = age;
    }
}

/**
 * 标准的懒汉式设计模式
 */
public class DemoTest2 {
    private String name;

    private DemoTest2(){}

    public String getName() {
        return name;
    }

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

    public DemoTest2 ok(){
        DemoTest2 demoTest2 = new DemoTest2();
        demoTest2.setName("");
        return demoTest2;
    }
}