package thinking_in_java;class X {
Y b = new Y(); X() {
System.out.print("X");
}
}class Y {
Y() {
System.out.print("Y");
}
}public class Z extends X {
Y y = new Y(); Z() {
System.out.print("Z");
} public static void main(String[] args) {
new Z();
}
}
输出结果为:YXYZ
请详细的讲讲输出顺序及为何,谢谢
Y b = new Y(); X() {
System.out.print("X");
}
}class Y {
Y() {
System.out.print("Y");
}
}public class Z extends X {
Y y = new Y(); Z() {
System.out.print("Z");
} public static void main(String[] args) {
new Z();
}
}
输出结果为:YXYZ
请详细的讲讲输出顺序及为何,谢谢
}public class MyInstanceTest implements MyInterface {
static String s; public static void main(String args[]) {
MyInstanceTest t = new MyInstanceTest();
if (t instanceof MyInterface) {
System.out.println("I am true interface");
} else {
System.out.println("I am false interface");
}
if (s instanceof String) {
System.out.println("I am true String");
} else {
System.out.println("I am false String");
}
}
}
还有这个,instanceof 不理解!!!
如果对象A是类B的实例则,
返回true,否则返回false.
I am true interface
I am false String
解释一下!谢谢!
public void run(){
System.out.println("MyThread: run()");
}
public void start(){
System.out.println("MyThread: start()");
}
}
class MyRunnable implements Runnable{
public void run(){
System.out.println("MyRunnable: run()");
}
public void start(){
System.out.println("MyRunnable: start()");
}
}
public class MyTest {
public static void main(String args[]){
MyThread myThread = new MyThread();
MyRunnable myRunnable = new MyRunnable();
Thread thread = new Thread(myRunnable);
myThread.start();
thread.start();
}
}
还有这个之间的继承关系!看了感觉不是太懂