Java中自定义枚举类，及枚举类的测试

标题：Java中自定义枚举类，及枚举类的测试

一、自定义枚举类 1）第一种自定义类来实现枚举类

//第一种自定义类来实现枚举类 class Grade{ //私有化构造器 private Grade() { } //创建类变量 public static final Grade A=new Grade(); public static final Grade B=new Grade(); public static final Grade C=new Grade(); public static final Grade D=new Grade(); public static final Grade E=new Grade(); }

2）第二种自定义类来实现枚举类

//第二种自定义类来实现枚举类 class Grade02{ private String name; private Grade02(String name) { this.name=name; } public static final Grade02 A=new Grade02("hhhA"); public static final Grade02 B=new Grade02("hhhB"); public static final Grade02 C=new Grade02("hhhC"); public String getName() { return name; } }

3)第三种自定义类来实现枚举类

//第三种自定义类来实现枚举类 abstract class Grade03{ private String name; private Grade03(String name) { this.name=name; } protected abstract void show(); public String getName() { return this.name; } public static final Grade03 A=new Grade03("hhhA") { protected void show() { System.out.println("jjjA"); } }; public static final Grade03 B=new Grade03("hhhB") { protected void show() { System.out.println("jjjB"); } }; }

二、使用枚举类 1）方式一

//方式一 enum Gra{ A,B,C; }

2）方式二

//方式二 enum Gra02{ A("A"),B("B"),C("C"); private String name; private Gra02(String name) { this.name=name; } public String getName() { return this.name; } }

3）方式三

//方式三 enum Gra03{ A("A"){ public void show() { System.out.println(this.getName()); } }, B("B"){ public void show() { System.out.println(this.getName()); } }, C("C"){ public void show() { System.out.println(this.getName()); } }; private String name; private Gra03(String name) { this.name=name; } public String getName() { return this.name; } public abstract void show(); }

三、完整代码如下：

/** * 测试枚举类 * @author dell * */ public class TestEnum { //jdk5之前 public void print(Grade02 g) {//只想要输入A、B、C、D、E System.out.println(g.getName()); } //测试第二种自定义枚举类 @Test public void test() { this.print(Grade02.B); } //测试第三种自定义枚举类 @Test public void test02() { Grade03.A.show(); } //测试枚举类 //第一种 @Test public void tes() { System.out.println(Gra.A); } //第二种 @Test public void tes02() { System.out.println(Gra02.A.getName()); } //第三种 @Test public void tes03() { Gra03.A.show(); } } //第一种自定义类来实现枚举类 class Grade{ //私有化构造器 private Grade() { } //创建类变量 public static final Grade A=new Grade(); public static final Grade B=new Grade(); public static final Grade C=new Grade(); public static final Grade D=new Grade(); public static final Grade E=new Grade(); } //第二种自定义类来实现枚举类 class Grade02{ private String name; private Grade02(String name) { this.name=name; } public static final Grade02 A=new Grade02("hhhA"); public static final Grade02 B=new Grade02("hhhB"); public static final Grade02 C=new Grade02("hhhC"); public String getName() { return name; } } //第三种自定义类来实现枚举类 abstract class Grade03{ private String name; private Grade03(String name) { this.name=name; } protected abstract void show(); public String getName() { return this.name; } public static final Grade03 A=new Grade03("hhhA") { protected void show() { System.out.println("jjjA"); } }; public static final Grade03 B=new Grade03("hhhB") { protected void show() { System.out.println("jjjB"); } }; } / //枚举类 //方式一 enum Gra{ A,B,C; } //方式二 enum Gra02{ A("A"),B("B"),C("C"); private String name; private Gra02(String name) { this.name=name; } public String getName() { return this.name; } } //方式三 enum Gra03{ A("A"){ public void show() { System.out.println(this.getName()); } }, B("B"){ public void show() { System.out.println(this.getName()); } }, C("C"){ public void show() { System.out.println(this.getName()); } }; private String name; private Gra03(String name) { this.name=name; } public String getName() { return this.name; } public abstract void show(); }

参考blog