简介
什么是泛型类？
泛型变量，在类定义时声明。
示例
package com.example;
import java.io.Serializable;
public class Request<T> implements Serializable {
private Long timestamp;
private T data;
public Long getTimestamp() {
return timestamp;
}
public void setTimestamp(Long timestamp) {
this.timestamp = timestamp;
}
public T getData() {
return data;
}
public void setData(T data) {
this.data = data;
}
@Override
public String toString() {
return "Request{" +
"timestamp=" + timestamp +
", data=" + data +
'}';
}
}
测试：
package com.example;
public class TestGeneric {
public static void main(String[] args) {
Request<String> req = new Request<>();
req.setTimestamp(1500000000L);
req.setData("Hello World");
System.out.println( req.toString() );
}
}
执行结果：
Request{timestamp=1500000000, data=Hello World}