在JDK8中，允许给接口本身添加一个默认的实现。用“default”进行修饰。如下实例
package interfacetest;
public interface TestInterface {
default int add(int x, int y) {
return x+y;
}
int sub(int x, int y);
}
package interfacetest;
public class TestInterfaceClass implements TestInterface {
@Override
public int sub(int x, int y) {
return x-y;
}
public static void main(String[] args) {
TestInterfaceClass testClass = new TestInterfaceClass();
System.out.println(testClass.add(1, 2));
System.out.println(testClass.sub(1, 2));
}
}
运行结果如下