Java实习二
链表（java实现）
Link.java
public class Link{
private Node first;
public Link(){
this.first = null;
}
//判断是否为空
public boolean isEmpty(){
if(this.first == null)
return true;
return false;
}
//插入头结点
public void insertHeadNode(int data){
Node tmp = new Node(data);
if(this.first == null)
first = tmp;
else
{
tmp.setNext(first.getNext());
first.setNext(tmp);
}
return ;
}
//在第index下插入data节点
public void insertNode(int data, int index){
Node p = this.first;
int cnt = 0;
while(cnt != index){
p = p.getNext();
cnt++;
}
Node newNode = new Node(data);
newNode.setNext(p.getNext());
p.setNext(newNode);
return ;
}
//delete the head node
public Node deleteHeadNode(){
Node tmp = first;
this.first = tmp.getNext();
return tmp;
}
//find the data in the link
public Node findNode(int data){
Node p = this.first;
while(p != null){
if(p.getData() == data)
return p;
if(p == null)
break;
p = p.getNext();
}
return null;
}
//display the link
public void displayLink(){
Node p = first;
while(p != null){
System.out.println(p.getData());
p = p.getNext();
}
return ;
}
}
Node.java
public class Node{
private int data;
private Node next;
//construction
public Node(){
this.data = 0;
this.next = null;
}
public Node(int data){
this.data = data;
this.next = null;
}
//get
public Node getNext(){
return this.next;
}
public int getData(){
return data;
}
//set
public void setNext(Node next){
this.next = next;
}
public void setData(int data){
this.data = data;
}
//show
public void nodeDisplay(){
System.out.println("{"+data+"}");
}
}
TestOfNode.java
public class TestOfNode{
public static void main(String[] args){
//test of Node
Node tmp1 = new Node(100);
tmp1.nodeDisplay();
Link tmp2 = new Link();
//test of insertHeadNode & displayLink
tmp2.insertHeadNode(00);
tmp2.displayLink();
//test of isEmpty
System.out.println(tmp2.isEmpty());
System.out.println("+++++\n\n");
//test of insertNode
tmp2.insertNode(11,0);
tmp2.insertNode(22,1);
tmp2.insertNode(33,2);
tmp2.insertNode(44,3);
tmp2.insertNode(55,4);
tmp2.insertNode(66,5);
tmp2.displayLink();
//test of delete the head Node
System.out.println("++++");
tmp2.deleteHeadNode();
tmp2.displayLink();
//test of find the data
if(tmp2.findNode(3310)!=null){
System.out.println("truely find the data:" + 3310);
}else{
System.out.println("fasle");
}
System.out.println("++++++");
//test of InsertHeadNode
tmp2.insertHeadNode(1111);
tmp2.insertHeadNode(2222);
tmp2.insertHeadNode(3333);
tmp2.displayLink();
}
}
排序 - 国家金牌银牌铜牌分别排序
TestOfNode.java
public class TestOfNode{
public static void main(String[] args){
//test of Node
Node tmp1 = new Node(100);
tmp1.nodeDisplay();
Link tmp2 = new Link();
//test of insertHeadNode & displayLink
tmp2.insertHeadNode(00);
tmp2.displayLink();
//test of isEmpty
System.out.println(tmp2.isEmpty());
System.out.println("+++++\n\n");
//test of insertNode
tmp2.insertNode(11,0);
tmp2.insertNode(22,1);
tmp2.insertNode(33,2);
tmp2.insertNode(44,3);
tmp2.insertNode(55,4);
tmp2.insertNode(66,5);
tmp2.displayLink();
//test of delete the head Node
System.out.println("++++");
tmp2.deleteHeadNode();
tmp2.displayLink();
//test of find the data
if(tmp2.findNode(3310)!=null){
System.out.println("truely find the data:" + 3310);
}else{
System.out.println("fasle");
}
System.out.println("++++++");
//test of InsertHeadNode
tmp2.insertHeadNode(1111);
tmp2.insertHeadNode(2222);
tmp2.insertHeadNode(3333);
tmp2.displayLink();
}
}
Test.java
import java.util.Arrays;
public class Test{
public static void main(String[] args){
Country American = new Country(46,37,38);
Country English = new Country(27,23,17);
Country China = new Country(26,18,26);
Country Russia = new Country(19,18,19);
Country Germany = new Country(17,10,15);
Country[] countrys = new Country[5];
countrys[0] = American;
countrys[1] = English;
countrys[2] = China;
countrys[3] = Russia;
countrys[4] = Germany;
Arrays.sort(countrys);
for(Country cty:countrys)
System.out.println(cty.gold + " " + cty.silver + " " + cty.copper + " " + cty.sum);
}
}
Coffee 类 - 面向对象编程
Coffee.java
package coffee;
//增加的方法
abstract class AddImplement{
private String name;
public void setName(String name){
this.name = name;
}
public String getName(){
return this.name;
}
public abstract void add();
}
class AddSugarImplement extends AddImplement{
public void add(){
System.out.println("you have added the Sugar^_^");
}
}
class AddMilkImplement extends AddImplement{
public void add(){
System.out.println("you have added the Milk ^_^");
}
}
//抽象类的实现
public abstract class Coffee{
private AddImplement addimpl;
//然后在调用add进行输出
public void add(){
addimpl.add();
};
//应该先调用这个设置函数
public void setAddImpl(AddImplement addimpl){
this.addimpl = addimpl;
};
}
class InstantCoffee extends Coffee{
public void setAddImpl(AddImplement addimpl){
System.out.println("This is an InstantCoffee^_^");
super.setAddImpl(addimpl);
}
}
class LatteCoffee extends Coffee{
public void
setAddImpl(AddImplement addimpl){
System.out.println("This is a LatteCoffee^_^");
super.setAddImpl(addimpl);
}
}
class MochaCoffee extends Coffee{
public void setAddImpl(AddImplement addimpl){
System.out.println("This is a MochaCoffee^_^");
super.setAddImpl(addimpl);
}
}
MainTest.java
package coffee;
import java.util.Scanner;
public class MainTest {
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
String choice = new String();
String addsth = new String();
while(true){
System.out.println("What kind of coffe would you want ?");
choice = in.nextLine();
System.out.println("What would you like to add ?Sugar or Milk?");
addsth = in.nextLine();
if(choice.equals("InstantCoffee")){
Coffee c1 = new InstantCoffee();
if(addsth.equals("Sugar")){
AddImplement a1 = new AddSugarImplement();
c1.setAddImpl(a1);
c1.add();
}else if(addsth.equals("Milk")){
AddImplement a2 = new AddMilkImplement();
c1.setAddImpl(a2);
c1.add();
}else{
System.out.println("Sorry,we don't have this kind of things *_*");
}
}else if(choice.equals("LatteCoffee")){
Coffee c1 = new LatteCoffee();
if(addsth.equals("Sugar")){
AddImplement a1 = new AddSugarImplement();
c1.setAddImpl(a1);
c1.add();
}else if(addsth.equals("Milk")){
AddImplement a2 = new AddMilkImplement();
c1.setAddImpl(a2);
c1.add();
}else{
System.out.println("Sorry,we don't have this kind of things *_*");
}
}else if(choice.equals("MochaCoffee")){
Coffee c1 = new MochaCoffee();
if(addsth.equals("Sugar")){
AddImplement a1 = new AddSugarImplement();
c1.setAddImpl(a1);
c1.add();
}else if(addsth.equals("Milk")){
AddImplement a2 = new AddMilkImplement();
c1.setAddImpl(a2);
c1.add();
}else{
System.out.println("Sorry,we don't have this kind of things *_*");
}
}else{
System.out.println("We don't have this kind of Coffee*_*");
}
}
}
}
模拟一个文件复制过程
Test.java
package test;
//系统成分类
abstract class attribute{
int cnt;
// public abstract void operation1();
public abstract void output();
public abstract void copy();
public abstract void traverseDirectory();
}
//目录类
class Folder extends attribute{
private attribute [] parts = new attribute[100];
private String name;
public int cnt = 0;
private int index = 0;
//构造函数部分
Folder(){}
Folder(String name){
this.name = name;
}
//复制操作
// public void operation1(){
// System.out.println("复制文件：" + name);
// }
public void output(){
System.out.println("+" + name);
}
public void add(Folder name){
parts[index] = name;
index++;
name.cnt = this.cnt + 1;
}
public void add(File name){
parts[index] = name;
index++;
name.cnt = this.cnt + 1;
}
public boolean remove(attribute a){
for(int i = 0 ; i < index ;i++){
if(parts[i].equals(a)){
parts[i] = null;
return true;
}
}
return false;
}
//有几个操作
public int getchild(){
return index;
}
//遍历操作
public void traverseDirectory(){
this.output();
for(int i = 0 ; i < index; i++){
for(int k = 0 ; k <= this.cnt; k++){
System.out.print(" ");
}
this.parts[i].traverseDirectory();
}
}
public void copy(){
System.out.println("复制文件：" + name);
for(int j = 0 ; j < this.index ;j++){
this.parts[j].copy();
}
}
}
//文件类
class File extends attribute{
public String name;
public int cnt = 0;
File(String name){
this.name = new String(name);
}
public void output(){
System.out.println("-" + name);
}
public void copy(){
System.out.println("复制文件:" + name);
}
// public void operation1(){
// System.out.println("复制文件:" + name);
// }
public void traverseDirectory(){
this.output();
}
}
public class Test{
public static StringBuffer st = new StringBuffer();
public static void main(String[] args){
Folder document = new Folder("我的资料");
File book = new File("Java编程思想.pdf");
Folder music = new Folder("我的音乐");
File music1 = new File("你是我的眼.mp3");
File music2 = new File("Without You.mp3");
Folder picture = new Folder("我的照片");
File pic1 = new File("我在美国白宫的照片");
File pic2 = new File("我在新加坡的照片");
File pic3 = new File("我在南极的照片");
File pic4 = new File("我在南非的照片");
File pic5 = new File("我与***的合影");
document.add(book);
document.add(music);
music.add(music1);
music.add(music2);
picture.add(pic1);
picture.add(pic2);
picture.add(pic3);
picture.add(pic4);
picture.add(pic5);
document.copy();
System.out.println("-------------------------------");
document.traverseDirectory();
picture.traverseDirectory();
}
}
代码改变世界
