组合的示例代码 java_java实现Composite组合模式的实例代码
//20210121
寫在前面:剛期末考試完,考了面向?qū)ο?#xff0c;里邊兒有23個設(shè)計模式,我尋思著考完挨個兒實(shí)現(xiàn)一下,本文實(shí)現(xiàn)組合模式
組合模式核心思想類似文件夾的概念,構(gòu)件樹形結(jié)構(gòu),樹形有葉子結(jié)點(diǎn)和文件夾結(jié)點(diǎn),文件夾結(jié)點(diǎn)可以包含葉子結(jié)點(diǎn)和文件夾結(jié)點(diǎn)
分為兩種模式
- 透明型:所有節(jié)點(diǎn)構(gòu)造全部相同,但是由于葉子結(jié)點(diǎn)沒有下層結(jié)點(diǎn),所以其有些方法為空,會不安全
- 安全型:葉子結(jié)點(diǎn)和文件架節(jié)點(diǎn)構(gòu)造不同,這樣展示的時候需要判斷節(jié)點(diǎn)屬性,不方便調(diào)用,但是由于沒有空方法,會很安全
透明型組合模式程序源代碼:
//節(jié)點(diǎn)抽象父類
/**
* 透明模式就是把組合使用的方法放到抽象類中,不管葉子對象還是數(shù)值對象都有相同的結(jié)構(gòu)
* 這樣做的好處就是葉子結(jié)點(diǎn)和樹枝結(jié)點(diǎn)對于外界沒有區(qū)別,他們具備完全一致的行為接口
*/
public abstract class ComponentTransparent {
protected String name;
public ComponentTransparent(String name){
this.name = name;
}
//增加一個葉子構(gòu)件或者樹枝構(gòu)件
public abstract void add(ComponentTransparent componentTransparent);
//刪除
public abstract void remove(ComponentTransparent componentTransparent);
//獲取分支下的所有葉子構(gòu)件和樹枝構(gòu)件
public abstract void display(int depth);
}
//文件架節(jié)點(diǎn)實(shí)現(xiàn)子類
import java.util.ArrayList;
public class CompositeTransparent extends ComponentTransparent{
public CompositeTransparent(String name){
super(name);
}
//構(gòu)建容器
private ArrayList componentTransparentsArraylist= new ArrayList<>();
@Override
public void add(ComponentTransparent componentTransparent) {
this.componentTransparentsArraylist.add(componentTransparent);
}
@Override
public void remove(ComponentTransparent componentTransparent) {
this.componentTransparentsArraylist.remove(componentTransparent);
}
@Override
public void display(int depth) {
//輸出樹形結(jié)構(gòu)
for (int i = 0;i
System.out.print("-");
}
System.out.println(this.name);
//下級遍歷
for(ComponentTransparent componentTransparent:this.componentTransparentsArraylist){
componentTransparent.display(depth+1);
}
}
}
//葉子節(jié)點(diǎn)實(shí)現(xiàn)子類
public class LeafTransparent extends ComponentTransparent{
public LeafTransparent(String name){
super(name);
}
@Override
public void add(ComponentTransparent componentTransparent) {
//空實(shí)現(xiàn),拋出"不支持請求"異常
throw new UnsupportedOperationException();
}
@Override
public void remove(ComponentTransparent componentTransparent) {
throw new UnsupportedOperationException();
}
@Override
public void display(int depth) {
//輸出樹形結(jié)構(gòu)的葉子節(jié)點(diǎn)
for (int i = 0;i
System.out.print("-");
}
System.out.println(this.name);
}
}
安全型組合模式源代碼:安全型中,葉子結(jié)點(diǎn)沒有增加移除方法,方法需要自己實(shí)現(xiàn),而不會在父類中指出
//節(jié)點(diǎn)抽象父類
public abstract class ComponentSafty {
protected String name;
public ComponentSafty(String name){
this.name = name;
}
//展示
public abstract void display(int depth);
}
//文件夾節(jié)點(diǎn)實(shí)現(xiàn)子類
import java.util.ArrayList;
public class CompositeSafty extends ComponentSafty{
public CompositeSafty(String name){
super(name);
}
private ArrayList componentSaftyArrayList = new ArrayList<>();
public void add(ComponentSafty component){
this.componentSaftyArrayList.add(component);
}
public void remove(ComponentSafty componentSafty){
this.componentSaftyArrayList.remove(componentSafty);
}
@Override
public void display(int depth) {
for (int i=0;i
System.out.print("-");
}
System.out.println(this.name);
for (ComponentSafty componentSafty : componentSaftyArrayList) {
componentSafty.display(depth+1);
}
}
}
//葉子結(jié)點(diǎn)實(shí)現(xiàn)子類
public class LeafSafty extends ComponentSafty{
public LeafSafty(String name){
super(name);
}
@Override
public void display(int depth) {
for (int i=0;i
System.out.print("-");
}
System.out.println(this.name);
}
}
測試主類程序源代碼
//測試主類
public class Main {
private static void transparent(){
//創(chuàng)建根節(jié)點(diǎn)以及其子節(jié)點(diǎn)
ComponentTransparent root = new CompositeTransparent("root");
root.add(new LeafTransparent("Leaf A"));
root.add(new LeafTransparent("Leaf B"));
//創(chuàng)建第二層結(jié)點(diǎn)及其子節(jié)點(diǎn)
ComponentTransparent branch = new CompositeTransparent("Composite X");
branch.add(new LeafTransparent("Leaf XA"));
branch.add(new LeafTransparent("Leaf XB"));
root.add(branch);
//創(chuàng)建第三層節(jié)點(diǎn)及其子結(jié)點(diǎn)
ComponentTransparent branch2 = new CompositeTransparent("Composite XY");
branch2.add(new LeafTransparent("Leaf XYA"));
branch2.add(new LeafTransparent("Leaf XYB"));
branch.add(branch2);
//創(chuàng)建第二層結(jié)點(diǎn)
root.add(new LeafTransparent("Leaf C"));
//常見第二層節(jié)點(diǎn)并刪除
ComponentTransparent leaf = new LeafTransparent("Leaf D");
root.add(leaf);
root.display(1);
root.remove(leaf);
for(int i =0;i<10;++i){
System.out.print("=");
}
System.out.println();
//展示
root.display(1);
}
private static void safty(){
//創(chuàng)建根節(jié)點(diǎn)以及其子節(jié)點(diǎn)
CompositeSafty root = new CompositeSafty("root");
root.add(new LeafSafty("Leaf A"));
root.add(new LeafSafty("Leaf B"));
//創(chuàng)建第二層結(jié)點(diǎn)及其子節(jié)點(diǎn)
CompositeSafty branch = new CompositeSafty("Composite X");
branch.add(new LeafSafty("Leaf XA"));
branch.add(new LeafSafty("Leaf XB"));
root.add(branch);
//創(chuàng)建第三層節(jié)點(diǎn)及其子結(jié)點(diǎn)
CompositeSafty branch2 = new CompositeSafty("Composite XY");
branch2.add(new LeafSafty("Leaf XYA"));
branch2.add(new LeafSafty("Leaf XYB"));
branch.add(branch2);
//創(chuàng)建第二層結(jié)點(diǎn)
root.add(new LeafSafty("Leaf C"));
//常見第二層節(jié)點(diǎn)并刪除
LeafSafty leaf = new LeafSafty("Leaf D");
root.add(leaf);
root.display(1);
root.remove(leaf);
for(int i =0;i<10;++i){
System.out.print("=");
}
System.out.println();
//展示
root.display(1);
}
public static void main(String[] args) {
System.out.println("透明模式:");
transparent();
for(int i =0;i<10;++i){
System.out.print("=");
}
System.out.println();
System.out.println("安全模式:");
safty();
}
}
輸出如下:
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