Android入门教程（五）

public class TestSwitch{
public static void main(String args []){
char c = 'a';
switch(c){
case 'b':
System.out.println('b');
break;
case 'c':
System.out.println('c');
break;
case 'a':
System.out.println('a');
break;
default:
System.out.println('d');
}
    }
}

public class Test01{
 public static void main(String args []){
 int score = 90;
 if(score > 85 && score <= 100){
 System.out.println("成绩为优");
 }
 else if(score > 75 $$ score <= 85){
 System.out.println("成绩为良");
 }
 else if(score > 60 $$ score <= 75){
 System.out.println("成绩为中");
 }
 else if(score <= 60 && score >= 0){
 System.out.println("成绩为差");
 }
 else if(score > 100 || score < 0){
 System.out.println("成绩不在正常的范围之内");
 }
 }
}

public class TestWhile{
 public static void main(String args []){
  int i = 0;
  while(i < 10){
   System.out.println(i);
   i++;
   } 
  }
}

class TestPfrimeNumber{
 public static void main(String args []){
  for(int i = 100; i < 201; i++){
   boolean b = false;

   for(int j = 2 ; j < i - 1; j++){

    int k = i % j;
     if(k == 0){
      b = true;
     }
    }
//如果不是true就打印出素数
    if(!b){
     System.out.println(i);
    }
   }
  }
}

public class Test{
public static void main(String args[]){
int i = 5;
int j = i++ + 5;
System.out.println(j);
System.out.println(i);
}
}

class TestTriangle{

public static void main(String args []){
 for(int i=1; i<5; i++){
  for(int j=0; j<4-i; j++){
   System.out.print(" ");
  } 
  for(int k=0; k<i; k++){
   System.out.print("* ");
  }
  System.out.println("");
  }
 }
}

class Test{
public static void main(String args []){
Dog d = new Dog();
d.name="旺财";
d.age=2;
d.color="黑色";
d.jump();
System.out.println("名字是"+d.name);
}}

class A{
 void funA(){
  System.out.println("没有参数的funA函数");
 }
 void funA(int i){
  System.out.println("拥有一个整型参数的funA函数");
 }
 void funA(int i,double d){
  System.out.println("拥有两个参数的funA函数");
}

class Test{
 public static void main(String args[]){
  A a = new A();
  a.funA();
  a.funA(1,3.2）；
  }
}

class Person{
 static{
  System.out.println("dd");
 }
 static String name;
 ..
}

class Person{
 String name;
 int age;
 Person(){
  System.out.println("Person的无参数构造函数");
 }
 Person(String name,int age){
  this.name = name;
  this.age = age;
  System.out.println("Person有参数构造函数");
 }
 void eat(){
  System.out.println("吃饭");
 }
}

class Student extends Person{
//在子类的构造函数当中，必须调用父类的构造函数
 Student(){
  super();
  System.out.println("Student的无参数构造函数");
 }
 Student(String name,int age,int a){
  super(name,age);
  this.a = a;
}

class Test{
 public static void main(String args[]){
  Student student = new student();
 }
}

class Student extends Person{
 String address;
 void introduce(){
  super.introduce();
  System.out.println("我的家在"+address);
 }
}

class Test{
 public static void main(String args[]){
  String s = new Student();
  Person p = s;
 
  p.name = "hhh";
  p.age = 20;
  //p.address = "beijing";
  p.introduce();
  //p.study();
  }
}

abstract void fun();
class Person{
 String name;
 int age;
 
 void introduce(){
  System.out.println("我的名字是"+name+",我的年龄是"+age);
  }
  abstract void eat();
}

abstract class Person{
 Person(){
  System.out.println("Person的构造函数");
 }


 Person(String name,String age){
  this.name = name;
  this.age = age;
} 


 String name;
 int age;
 void introduce(){
  System.out.println("我的名字是"+name+",我的年龄是"+age);
 }
 abstract void eat();
}

class Chinese extends Person{

 String address;
 Chinese(){
  super();
  System.out.println("Chinese的构造函数");
 }

 Chinese(String name,int age,String address){
  super(name,age);
  this.address = address;
}
 void eat(){
  System.out.println("用筷子吃饭");
 }
}

class Test{
 public static void main(String args[]){
  Person p = new Chinese();
  P.eat();
  }
}

abstract class Printer{
 void open(){
  System.out.println("open");
 }
 void close(){
  System.out.println("close");
 }
 abstract void print();
}

package hhh;
class Test{
 public static void main(String args[]){
  System.out.println("hellos");
 }
}

package com.hh;
public class Person{
 String name;
 int age;
 void eat(){
  System.out.println("eat");
 }
 void sleep(){
  System.out.println("sleep");
 }
}

package cn.mm;
import com.hh;
class Student extends Person{
 void introduce(){
  System.out.println("我的名字是"+name+",haha"+age);
 }
}