Java 9 在接口中添加了私有方法新功能。可以使用private修饰符来定义私有方法。我们可以在Java 9的接口中添加私有和私有静态方法
接口中私有方法的规则：
<strong>interface <interface-name> {
private methodName(parameters) {
// some statements
}
}</strong>interface TestInterface {
<strong>default </strong>void methodOne() {
System.out.println("This is a Default method One...");
printValues(); // calling a private method
}
<strong>default </strong>void methodTwo() {
System.out.println("This is a Default method Two...");
printValues(); // calling private method...
}
<strong>private </strong>void <strong>printValues</strong><strong>()</strong> { <strong>// private method in an interface
</strong> System.out.println("methodOne() called");
System.out.println("methodTwo() called");
}
}
public class PrivateMethodInterfaceTest implements TestInterface {
public static void main(String[] args) {
TestInterface instance = new PrivateMethodInterfaceTest();
instance.methodOne();
instance.methodTwo();
}
}<strong>This is a Default method One... methodOne() called methodTwo() called This is a Default method Two... methodOne() called methodTwo() called</strong>
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