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Java 5.0 ·ºÐÍÖ® ÊÜÏÞ·ºÐÍ

package Demo;
// ÊÜÏÞ·ºÐÍ
class Info17<T> {
private T var; // ¶¨Òå·ºÐͱäÁ¿
public void setVar(T var) {
this.var = var;
}
public T getVar() {
return this.var;
}
public String toString() { // Ö±½Ó´òÓ¡
return this.var.toString();
}
}
public class GenericsDemo17 {
public static void main(String args[]) {
Info17<Integer> i1 = new Info17<Integer>(); // ÉùÃ÷IntegerµÄ·ºÐͶÔÏó
Info17<Float> i2 = new Info17<Float>(); // ÉùÃ÷FloatµÄ·ºÐͶÔÏó
i1.setVar(30); // ÉèÖÃÕûÊý£¬×Ô¶¯×°Ïä
i2.setVar(30.1f); // ÉèÖÃСÊý£¬×Ô¶¯×°Ïä
fun(i1);
fun(i2);
}
public static void fun(Info17<? extends Number> value) { // Ö»ÄܽÓÊÕNumber¼°ÆäNumberµÄ×ÓÀà
System.out.println(value);
}
}
package Demo;
// ÊÜÏÞ·ºÐÍ
class Info21<T> {
private T var; // ¶¨Òå·ºÐͱäÁ¿
public void setVar(T var) {
this.var = var;
}
public T getVar() {
return this.var;
}
public String toString() { // Ö±½Ó´òÓ¡
return this.var.toString();
}
}
public class GenericsDemo21 {
public static void main(String args[]) {
Info21<String> i1 = new Info21<String>(); // ÉùÃ÷StringµÄ·ºÐͶÔÏó
Info21<Object> i2 = new Info21<Object>(); // ÉùÃ÷ObjectµÄ·ºÐͶÔÏó
i1.setVar("hello");
i2.setVar(new Object());
fun(i1);
fun(i2);
}
public static void fun(Info21<? super String> value) { // Ö»ÄܽÓÊÕString»òObjectÀàÐ͵ķºÐÍ
System.out.println(value);
}
}


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Java»ù´¡£ºµÚÊ®°Ë½² StringÓ÷¨£¨ÉÏ£©

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   String s1 = "this is a string!";
   String s2 = new String("this is another string!");
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javaÔÚforÑ­»·ÖÐʹÓÃconcurrent°ü½øÐжàÏ̱߳à³Ì

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 public class CopyOfTestThreadPool {
 public static void main(String args[]) thr ......

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Java 5.0 ·ºÐÍÖ® ͨÅä·û

package Demo;
// ͨÅä·û
class Info14<T> {
private T var; // ¶¨Òå·ºÐͱäÁ¿
public void setVar(T var) {
this.var = var;
}
public T getVar() {
return this.var;
}
public String toString() { // Ö±½Ó´òÓ¡
return this.var.toString();
}
}
public class GenericsDemo14 {
public ......
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