如何创建类似于 C++ 模板类的 Java 类？
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How to create a Java class, similar to a C++ template class?
提问by sivabudh
How do I write an equivalent of this in Java?
我如何在 Java 中编写与此等效的代码？
// C++ Code
template< class T >
class SomeClass
{
private:
T data;
public:
SomeClass()
{
}
void set(T data_)
{
data = data_;
}
};
采纳答案by Laurence Gonsalves
class SomeClass<T> {
private T data;
public SomeClass() {
}
public void set(T data_) {
data = data_;
}
}
You probably also want to make the class itself public, but that's pretty much the literal translation into Java.
您可能还希望将类本身公开，但这几乎是 Java 的直译。
There are other differences between C++ templates and Java generics, but none of those are issues for your example.
C++ 模板和 Java 泛型之间还有其他差异，但对于您的示例而言，这些都不是问题。
回答by Moishe Lettvin
You use "generics" to do this in Java:
您可以使用“泛型”在 Java 中执行此操作：
public class SomeClass<T> {
private T data;
public SomeClass() {
}
public void set(T data) {
this.data = data;
}
};
Wikipedia has a good description of generics in Java.
回答by Bill
/**
* This class is designed to act like C#'s properties.
*/
public class Property<T>
{
private T value;
/**
* By default, stores the value passed in.
* This action can be overridden.
* @param _value
*/
public void set (T _value)
{
value = _value;
}
/**
* By default, returns the stored value.
* This action can be overridden.
* @return
*/
public T get()
{
return value;
}
}
回答by Jim Yanyan Bai
public class GenericClass<T> {
private T data;
public GenericClass() {}
public GenericClass(T t) {
this.data = t;
}
public T getData() {
return data;
}
public void setData(T data) {
this.data = data;
}
// usage
public static void main(String[] args) {
GenericClass<Integer> gci = new GenericClass<Integer>(new Integer(5));
System.out.println(gci.getData()); // print 5;
GenericClass<String> gcs = new GenericClass<String>();
gcs.setData("abc");
System.out.println(gcs.getData()); // print abc;
}
}
