是的，我们可以在 Java 9 的接口中拥有私有方法或私有静态方法。可以使用这些方法来去除代码冗余。 私有方法只能在该界面中有用或可访问。我们无法从一个接口访问或继承私有方法到另一个接口或类。
语法
interface{ private static void methodName() { // some statements } private void methodName() { // some statements } }
示例
interface Java9Interface {
public abstract void method1();
public default void method2() {
method4();
method5();
System.out.println("Inside default method");
}
public static void method3() {
method5(); // static method inside other static method
System.out.println("Inside static method");
}
private void method4() { // private method
System.out.println("Inside private method");
}
private static void method5() { // private static method
System.out.println("Inside private static method");
}
}
public class PrivateStaticMethodTest implements Java9Interface {
@Override
public void method1() {
System.out.println("Inside abstract method");
}
public static void main(String args[]) {
Java9Interface instance = new PrivateStaticMethodTest();
instance.method1();
instance.method2();
Java9Interface.method3();
}
}输出
Inside abstract method Inside private method Inside private static method Inside default method Inside private static method Inside static method
