用泛型表示接口

第 38 / 58 卷日期：2020-05-10

1//ਧԎӞӻာࣳളݗ 2public interface Generator<T> {

3public T next();

Ӟᛱာࣳളݗଉአԭ࢏ኞ౮(generator) Ӿ҅ኞ౮࢏ፘ୮ԭ੒᨝ૡܯ҅ฎӞᐿӫᳪአ๶ڠୌ੒᨝ጱ ᔄ̶

ာࣳොဩ

ݢզֵአာࣳ๶ᤒᐏොဩ

1public class GenericMethods { 2public <T> void f(T x){

3	System.out.println(x.getClass().getName());
4	}
5	}

ာࣳ᭗ᯈᒧ

List ฎာࣳᔄ҅ԅԧᤒᐏݱᐿာࣳList ጱᆿᔄ҅ݢզֵአᔄࣳ᭗ᯈᒧ҅ᔄࣳ᭗ᯈᒧֵአݩᳯ(?) ᤒ ᐏ҅ਙጱزᔰᔄࣳݢզ܃ᯈձ֜ᔄ̶ֺࣳই

1public static void main(String[] args) {

2	List<String>name=newArrayList<String>();
3	List<Integer>age=newArrayList<Integer>();
4	List<Number>number=newArrayList<Number>();
5	name.add("cxuan");
6	age.add(18);
7	number.add(314);
8	generic(name);
9	generic(age);
10	generic(number);
11	}

13	publicstaticvoidgeneric(List<?>data){
14	System.out.println("Testcxuan:"+data.get(0));
15	}

Ӥኴ᭗ᯈᒧ : <? extends ClassType> ᧆ᭗ᯈᒧԅ ClassType ጱಅํৼᔄ̶ࣳਙᤒᐏጱฎձ֜ᔄࣳ᮷ฎ ClassType ᔄࣳጱৼᔄ̶

ӥኴ᭗ᯈᒧғ <? super ClassType> ᧆ᭗ᯈᒧԅ ClassType ጱಅํ᩻ᔄ̶ࣳਙᤒᐏጱฎձ֜ᔄࣳጱᆿ ᔄ᮷ฎ ClassType̶

੘ݍ

Java ݍ੘๢ګฎࣁᑕଧጱᬩᤈᬦᑕӾ҅੒ԭձ֜Ӟӻᔄ҅᮷ᚆड़Ꭳ᭲ਙጱಅํં௔޾ොဩҔ੒ԭձ఺ Ӟӻ੒᨝҅᮷ᚆड़Ꭳ᭲᧣አਙጱձ఺ં௔޾ොဩ҅ᬯᐿۖா឴מݐ௳զۖ݊ா᧣አ੒᨝ොဩጱۑᚆᑍԅ

java᧍᥺ጱݍ੘๢ګ̶ҁ๶რԭጯଶጯᑀ҂

Java ᚆۑӻپԧզӥᬯ׀Ԇᥝ൉ګ੘๢ݍ

ࣁᬩᤈ෸ڣෙձ఺Ӟӻ੒᨝ಅંጱᔄ ࣁᬩᤈ෸຅᭜ձ఺Ӟӻᔄጱ੒᨝

ࣁᬩᤈ෸ڣෙձ఺Ӟӻᔄಅํጱ౮ݒާᰁ޾ොဩ ࣁᬩᤈ෸᧣አձ఺Ӟӻ੒᨝ጱොဩ

ᬯԍӞ፡҅ݍ੘੪؟ฎӞӻഩഴقੴጱ᥯ᜋ҅ӧᓕ֦ᑕଧெԍᬩᤈ҅౯᮷ᚆड़Ꭳ֦᭲ᬯӻᔄํߺԶં௔ ޾ොဩ֦҅ᬯӻ੒᨝ฎኧ᧡᧣አጱ҅ࡧ҅உ䌷̶

ࣁ Java አֵӾ҅Java.lang.reflect ۱ਫሿԧݍ੘๢ګ̶Java.lang.reflect ಅᦡᦇጱᔄইӥ

ӥᶎฎӞӻᓌܔጱݍ੘ᔄ

1public class Person { 2public String name;// ݷন

3public int age;// ଙἻ 4

5public Person() { 6super();

7} 8

9public Person(String name, int age) { 10super();

11this.name = name;

12this.age = age;

17} 18}

19 20public class Student extends Person implements Study {

21public String className;// ቔᕆ 22private String address;// ࣎֘

23 24public Student() {

25super();

26} 27

28	publicStudent(Stringname,intage,StringclassName,Stringaddress){
29	super(name,age);
30	this.className=className;
31	this.address=address;
32	}

33 34public Student(String className) {

35this.className = className;

36} 37

38public String toString() { 39return "ғݷন" + name + ",ଙἻғ" + age + ",ቔᕆғ" + className + ",࣎֘ғ"

40+ address;

41} 42

43public String getAddress() { 44return address;

45} 46

47	publicvoidsetAddress(Stringaddress){
48	this.address=address;
49	}
50	}

51 52public class TestRelect {

53 54public static void main(String[] args) {

55Class student = null;

56try {

57	student=Class.forName("com.cxuan.reflection.Student");
58	}catch(ClassNotFoundExceptione){
59	e.printStackTrace();
60	}
62	// ឴ݐ੒᨝ጱಅํلํં௔̶
63	Field[]fields=student.getFields();

69	Field[]declaredFields=student.getDeclaredFields();
70	for(Fielddf:declaredFields){
71	System.out.println(df);
72	}

73 74// ឴ොဩول੒᨝ጱಅํݐ

75	Method[]methods=student.getMethods();
76	for(Methodm:methods){
77	System.out.println(m);
78	}
79	System.out.println("---------------------");
80	// ឴ݐ੒᨝ಅํොဩ҅֕ӧ۱ތᖀಥጱ
81	Method[]declaredMethods=student.getDeclaredMethods();
82	for(Methoddm:declaredMethods){
83	System.out.println(dm);
84	}

85 86// ឴ݐ੒᨝ಅํጱول຅᭜ොဩ

87	Constructor[]constructors=student.getConstructors();
88	for(Constructorc:constructors){
89	System.out.println(c);
90	}
91	System.out.println("---------------------");
92	// ឴ݐ੒᨝ಅํጱ຅᭜ොဩ
93	Constructor[]declaredConstructors=student.getDeclaredConstructors();
94	for(Constructordc:declaredConstructors){
95	System.out.println(dc);
96	}

98	Classc=Class.forName("com.cxuan.reflection.Student");
99	Studentstu1=(Student)c.newInstance();
100	//ᒫӞᐿොဩ҅ਫ۸ֺἕᦊ຅᭜ොဩ҅᧣አ setᩙ꧊
101	stu1.setAddress("မ۹Ꭺਹଢ");
102	System.out.println(stu1);

103

104	//ᒫԫᐿොဩහڍ᮱ጱ຅᭜ق஑ݐֵ አ຅᭜ڍහᩙ꧊
105	Constructor<Student>constructor=c.getConstructor(String.class,
106	int.class,

String.class, String.class);

107Student student2 = (Student) constructor.newInstance("cxuan", 24, "م ቔ", "Ꭺਹଢ");

108System.out.println(student2);

109 110/**

111* 劧ݐොဩଚಗᤈොဩ 112*/

113Method show = c.getMethod("showInfo");//឴ݐshowInfo()ොဩ

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