Java中C#匿名方法的等效? [英] Equivalent of C# anonymous methods in Java?
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问题描述
在C#中,您可以匿名定义代理(尽管它们只不过是语法糖)。例如,我可以这样做:
public string DoSomething(Func< string,string> someDelegate)
{
//做一些涉及someDelegate(string s)的事情
}
DoSomething(delegate(string s){return s + =asd;});
DoSomething(delegate(string s){return s.Reverse();});
是否可以在Java中传递这样的代码?我正在使用处理框架,它具有相当旧版本的Java(它没有泛型)。
解决方案
前Java 8:
<最接近的Java必须是单方法接口。你可以使用匿名的内部类。
interface StringFunc {
String func(String s);
}
void doSomething(StringFunc funk){
System.out.println(funk.func(whatever));
}
doSomething(new StringFunc(){
public String func(String s){
return s +asd;
}
});
doSomething(new StringFunc(){
public String func(String s){
return new StringBuffer(s).reverse()。toString();
}
});
Java 8及更高版本: strong>
Java 8 向该语言添加lambda表达式。
doSomething((t) - > t +asd );
doSomething((t) - > new StringBuilder(t).reverse()。toString());
In C# you can define delegates anonymously (even though they are nothing more than syntactic sugar). For example, I can do this:
public string DoSomething(Func<string, string> someDelegate)
{
// Do something involving someDelegate(string s)
}
DoSomething(delegate(string s){ return s += "asd"; });
DoSomething(delegate(string s){ return s.Reverse(); });
Is it possible to pass code like this in Java? I'm using the processing framework, which has a quite old version of Java (it doesn't have generics).
解决方案
Pre Java 8:
The closest Java has to delegates are single method interfaces. You could use an anonymous inner class.
interface StringFunc {
String func(String s);
}
void doSomething(StringFunc funk) {
System.out.println(funk.func("whatever"));
}
doSomething(new StringFunc() {
public String func(String s) {
return s + "asd";
}
});
doSomething(new StringFunc() {
public String func(String s) {
return new StringBuffer(s).reverse().toString();
}
});
Java 8 and above:
Java 8 adds lambda expressions to the language.
doSomething((t) -> t + "asd");
doSomething((t) -> new StringBuilder(t).reverse().toString());
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