com.aspire.nm.component.commonUtil.commonMenu.Menu Maven / Gradle / Ivy
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commonUtil is a dajiangnan's java utils
package com.aspire.nm.component.commonUtil.commonMenu;
import java.io.IOException;
import java.util.ArrayList;
import org.apache.log4j.Logger;
import com.aspire.nm.component.commonUtil.commonMenu.base.IfTarget;
import com.aspire.nm.component.commonUtil.commonMenu.base.IfTitle;
public class Menu implements IfTarget{
private static Logger logger = Logger.getLogger(Menu.class);
private ArrayList items = new ArrayList();
private Menu parentMenu ;
public Menu(Menu parentMenu){
this.parentMenu = parentMenu;
}
public ArrayList getItems() {
return items;
}
@Override
public void process() {
for(IfTitle item:items){
System.out.println(item.getInput()+" : " + item.getTitle());
}
if(parentMenu != null){
System.out.println("9 : back");
}
if(parentMenu == null){
System.out.println("0 : exit");
}
System.out.print("select menu:");
String input=userInput();
if(parentMenu == null && input.trim().equals("0")){
return;
}else if(parentMenu != null && input.trim().equals("9")){
parentMenu.process();
}else if(getSelectItem(input) != null){
IfTarget target = getSelectItem(input).getTarget();
if(target != null){
target.process();
}else{
System.out.println("target is null!");
process();
}
}else{
System.out.println("input error!");
process();
}
}
private IfTitle getSelectItem(String input){
for(IfTitle item:items){
if((input != null && input.trim().equals(item.getInput()))){
return item;
}
}
return null;
}
private String userInput(){
byte buffer[]=new byte[1024];
int count;
try {
count = System.in.read(buffer);
} catch (IOException e) {
logger.error(e);
return null;
}
//最后两位为结束符，删去不要
char[] ch=new char[count-2];
for(int i=0;i