swornsoft的专栏

//用instanceof判断类的类型public class SecondDay { /**  * auther:  * version:3.5.1  * @param  * JDK version used7.1.0  */ public static void main(String[] args) {  // TODO Auto-generated meth

package zhangsan.lisi;//此类证明了super方法的使用，以及方法的重写class Anum{ public void fun1(){//同名 同参数 同返回值  System.out.println("AAAA"); } public void fun1(int i){//当然也可以构成方法的重载  System.out.print("HEIHE

package zhangsan.lisi;//此证明子类的权限不能低于父类的权限（实际中能够有应用）class Anum1{ public void fun1(){  System.out.println("AAAA"); }}class Bnum1 extends Anum1{ public void fun1(){//这里的类型改成private将会报错

package zhangsan.lisi;import java.io.BufferedReader;import java.io.InputStreamReader;public class InputZhongYao { public static void main(String[] args) {  try{   String str = null;  Buf

package zhangsan.lisi;public class MeiJu {public enum MeiJu1{ OPEN,CLOSE,SE}; public static void main(String[] args) {  MeiJu1 sparam = MeiJu1.OPEN;  switch(sparam){  case OPEN:   Sy

package zhangsan.lisi;import java.io.IOException;public class SubStr { private static int N = 0; /**  * @author   * version:3.5.1  * @param  * JDK version used7.1.0  * @throws IOExce

package zhangsan.lisi;//此例证明：通过抽象类实现了多态的知识abstract class Au{ abstract public void f(); //abstract public void g();子类必须对父类进行重写，否则编译报错} class Bu extends Au{  public void f() { System.out

package zhangsan.lisi;//STSTIC用法1class Apointer{ public static int aNumber = 100;//这里不加static 下面主函数中将不能直接对类A直接使用 public static void  funShion(){//这里也是同样的，必须加上Static下面才可以直接调用  System.out.prin

class Human1 { public String name ="？？？" ; public int age = 100;}class Student1 extends Human1{ public double score = 66.6;}class Graduate extends Student1 { public String daoshi = "？？

import java.math.BigInteger;import java.nio.Buffer;import java.util.Arrays;public class ZiFuChuanLeiXingZhuanHuan  { private static Object buffer; /**  * @param args  */ public stati

import java.util.Scanner;//从键盘输入一个10进制数据，将其16进制，8进制，2进制输出，课外补充将8,18,2转换成10进制public class YouPrint1 { /**  * auther:  * version:3.5.1  * @param  * JDK version used7.1.0  */ public sta

import java.lang.reflect.Array;import java.util.Arrays;//顺序数组中插入相应的值用二分查找法public class ChaArrays { /**  * @param args  */ public static void main(String[] args) {  // TODO Auto-generat

package zhangsan.lisi;public class DuoTai2 { public static void main(String []args){ Funtion aanew = new Funtion(); Funtion1 bbnew = new Funtion1(); //aanew.fun1(); //bbnew.fun2(); aanew

package zhangsan.lisi;//类成员访问修饰符    继承来自于不同包中的类class A{ public void g(){ System.out.println("AAAA\n"); }}  class B extends A{ private int age; public B(int age){  this.age = age; }

package zhangsan.lisi;public class FunChongZhai { static int add(int aNumber,int bNumber){  return aNumber + bNumber; } static double add(double aNumber,double bNumber){  return aNumber +

class F{ public void f(){  System.out.println("AAAA\n"); }}class G extends F{ public void f(){  System.out.println("BBBB\n"); }}public class DuoTai1 {public static void main(Stri

package zhangsan.lisi;class C{//A public void f(){  System.out.println("AAAA\n"); }}class D extends C{//B public void f(){  System.out.println("BBBB\n"); }}class E extends D{//

public class RuiNian{ public static void main (String [] args) {   int month=2,day=15; int sumDays = 0; int[] daysData = new int [] { 31,29,31,30,31,30,31,31,30,31,30,31}; switch( mont

import java.util.Arrays;public class maoPaoFa { /**  * @param args  */ public static void main(String[] args) {  // TODO Auto-generated method stub  int []a = new int[]{12,9,34,24,8,3,

import java.util.Scanner;public class  LingXing{public static void main(String []args){ int N; Scanner sc = new Scanner(System.in); System.out.println("请输入N的值"); N = sc.nextInt();for(

import java.util.Arrays;import java.util.Scanner;public class InsertData{ public static void main(String[] args){  Scanner sc = new Scanner(System.in);  System.out.println("请输入这个数据");

//99乘法表程序public class iMultitude { /**  * auther:  * version:3.5.1  * @param  * JDK version used7.1.0  */ public static void main(String[] args) {  // TODO Auto-generated method stub

import java.util.Scanner;//输入年份月份统计当月天数public class getDays { /**  * auther:  * version:3.5.1  * @param  * JDK version used7.1.0  */ public static void main(String[] args) {  // TO

//验证while的次数public class doWhile {  /**  * auther:  * version:3.5.1  * @param  * JDK version used7.1.0  */ public static void main(String[] args) {  // TODO Auto-generated method stu

传值和传引用的区别public class ChaString { /**  * @param args  */ public static void main(String[] args) {  // TODO Auto-generated method stub  /*System.out.println(args.length);  if(args.len

import java.util.Scanner;public class BiaoZhunLingXing { /**  * @param args  */ public static void main(String[] args) {  // TODO Auto-generated method stub  int N;  Scanner sc = new

import java.util.*;public class BitYunSuan { /**  * @author 赵晨杰  * version:3.5.1  * @param：  * JDK version used7.1.0  */ public static void main(String[] args) {    int iNumber ,iN

import java.util.*;public class Calculation{ public void add(int aNumber,int bNumber){  int cNumber = aNumber + bNumber; System.out.println("\n"+cNumber+"\n");  } public void add(float

package zhangsan.lisi;public class ChinaTest { public static void main(String [] args){    Aclass a = new Aclass(1,2);  Aclass b = new Aclass(5);  a.show();  b.show(); }}class Acla

public class DunZhan { public static void main(String[]args){   Action aNew= new Action(); Action bNew= new Action(); bNew = aNew;//如果只修改aNew.i或者bNew.i的任意一个值，不会影响其他取值 bNew.i = 20; aNew.s

package zhangsan.lisi;//含有抽象方法的类一定是抽象类，但是抽象类中不一定要有抽象方法abstract class An{ abstract public void f();//没有方法体的方法叫做抽象方法，必须用abstract修饰，如果有抽象方法，该类一定是抽象类        // 注意这里的没有方法体的意思就是没有{}来实现，如果加了大括号就不能声明为