Why are you not able to declare a class as static in Java?

解決方案

Only nested classes can be static. By doing so you can use the nested class without having an instance of the outer class.

class OuterClass{

public static class StaticNestedClass{

}

public class InnerClass{

}

public InnerClass getAnInnerClass(){

return new InnerClass();

}

//This method doesn't work

public static InnerClass getAnInnerClassStatically(){

return new InnerClass();

}

}

class OtherClass{

//Use of a static nested class:

private OuterClass.StaticNestedClass staticNestedClass = new OuterClass.StaticNestedClass();

//Doesn't work

private OuterClass.InnerClass innerClass = new OuterClass.InnerClass();

//Use of an inner class:

private OuterClass outerclass= new OuterClass();

private OuterClass.InnerClass innerClass2 = outerclass.getAnInnerClass();

private OuterClass.InnerClass innerClass3 = outerclass.new InnerClass();

}

Sources :

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