本文介绍了获得“真实”泛型类的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
如何获得泛型类型的真实类?
例如:
public class MyClass< T> {
public void method(){
// something
System.out.println(T.class)//导致编译错误,我不会使用类名
//某事
}
}
如果T =整数
输出:
java.lang.Integer
如果T = String
输出: p>
java.lang.String
Thanks
解决方案
如果在类中有类型T的实例变量,设置,那么你可以打印该变量的类。
public class Test< T> {
T var;
public static void main(String [] args){
Test< Integer> a = new Test< Integer>();
System.out.println(a.boo());
a.setVar(new Integer(10));
System.out.println(a.boo());
public String boo(){
if(var == null){
returnDo not know yet;
}
return var.getClass()。getSimpleName();
}
public void setVar(T var){
this.var = var;
}
public T getVar(){
return var;
}
}
How can I get the "real" class of a generic type?
For Example:
public class MyClass<T> {
public void method(){
//something
System.out.println(T.class) //causes a compile error, I wont the class name
//something
}
}
If T = Integer
Output:
java.lang.Integer
If T = String
Output:
java.lang.String
Thanks
解决方案
If you have a instance variable of type T in your class, and it happens to be set, then you could print the class of that variable.
public class Test<T> {
T var;
public static void main(String[] args) {
Test<Integer> a = new Test<Integer>();
System.out.println(a.boo());
a.setVar(new Integer(10));
System.out.println(a.boo());
}
public String boo() {
if (var == null) {
return "Don't know yet";
}
return var.getClass().getSimpleName();
}
public void setVar(T var) {
this.var = var;
}
public T getVar() {
return var;
}
}
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