摘要： public class Example8_4{public static void main(String arg[]){Left targetOfLeft=new Left();Thread left=new Thread(targetOfLeft);Right targetOfRight=new Right();Thread right=new Thread(targetOfRight);left.start();right.start();while(true){if(targetOfLeft.n==8||targetOfRight.n==8)System.exil(0);}}}cla 阅读全文

摘要： public class Example8_3{public static void main(String arg[]){Left left=new Left();Right right=new Right();left.start();right.start();while(true){if(left.n==8||right.n==8)System.exit(0);}} }class Left extends Thread{int n=0;public void run(){while (true){n++;System.out.printf("\n%s"," 阅读全文

摘要： class A{public void test(){int a=10; int b=20; System.out.println('a'); System.out.println('b'); System.out.println(a); System.out.println(b);}}public class ZiFu{public static void main(String arg[]){A a=new A();a.test();}} 阅读全文

摘要： abstract class Math{public abstract void f(int x);public abstract void g(int x,int y);public abstract double h(double x);}class Cheng extends Math{int x=10;int y=10;public void f(int x){System.out.println("我爱乘法");System.out.printf("x=%d",x);}public void g(int x,int y){System.out. 阅读全文

摘要： public class Example5_18{public static void main(String arg[]){int n=0,m=0,t=0;try{t=9999;m=Integer.parseInt("8888");n=Integer.parseInt("12s3a");System.out.println("我没有机会输出");}catch(Exception e){System.out.println("发生异常");n=123;}System.out.println("n=&quo 阅读全文

摘要： abstract class Student{abstract void speak();}class Teacher{void look(Student stu){stu.speak();}}public class Example5_16{public static void main(String arg[]){Teacher zhang=new Teacher();zhang.look(new Student(){void speak(){System.out.println("这是匿名类中的方法");}});}}interface Show{public void 阅读全文

摘要： interface ShowMessage{void showTradeMark();}class TV implements ShowMessage{public void showTradeMark(){System.out.println("我是电视机");}}class PC implements ShowMessage{public void showTradeMark(){System.out.println("我是电脑");}}public class Example5_12{public static void main(String a 阅读全文

摘要： interface Computable{final int MAX=100;int f(int x);public abstract int g(int x,int y);}class A implements Computable{public int f(int x){return x*x;}public int g(int x,int y){return x+y;}}class B implements Computable{public int f(int x){return x*x*x;}public int g(int x,int y){return x*y;}}public c 阅读全文

摘要： class Animal{ void cry(){}}class Dog extends Animal{void cry(){ System.out.println("wang!wang!......");}}class Cat extends Animal{ void cry(){System.out.println("miao~~miao~~...");}}public class Example5_9{public static void main(String arg[]){Animal animal; animal=new Dog(); ani 阅读全文

摘要： class A{ double n; int m;void f(){ System.out.printf("子类继承方法f(),n=%f,m=%d\n",n,m);}void g(){ System.out.printf("你好,n=%f,m=%d\n",n,m);}}class B extends A{int n=12; void g(){System.out.printf("子类重写方法g(),n=%d,m=%d\n",n,m);}void cry(){System.out.printf("子类新增的方法,n=%d,m= 阅读全文