删除数组中指定的某条记录

Question

请大大们先看代码：
    private CommunityEntity[] commArr;    public DbStore() //初始化用户实体数组
    {
     CommunityEntity com1 = new CommunityEntity();
     com1.setCommId("001");
     com1.setCommName("新升新苑");
     com1.setCommManager("大漠");
     com1.setCommArea("高新区");
     com1.setCommStatue("可放装");
     com1.setPermeability(61);
     com1.setUserCount(221);
    
     CommunityEntity com2 = new CommunityEntity();
     com2.setCommId("002");
     com2.setCommName("新盛花园");
     com2.setCommManager("大漠");
     com2.setCommArea("吴中区");
     com2.setCommStatue("可放装");
     com2.setPermeability(62);
     com2.setUserCount(222);
    
     CommunityEntity com3 = new CommunityEntity();
     com3.setCommId("003");
     com3.setCommName("新唯家园");
     com3.setCommManager("大漠");
     com3.setCommArea("工业园区");
     com3.setCommStatue("可放装");
     com3.setPermeability(63);
     com3.setUserCount(223);
    
     CommunityEntity com4 = new CommunityEntity();
     com4.setCommId("004");
     com4.setCommName("蠡东花园");
     com4.setCommManager("大漠");
     com4.setCommArea("相城区");
     com4.setCommStatue("可放装");
     com4.setPermeability(64);
     com4.setUserCount(224);
    
     CommunityEntity com5 = new CommunityEntity();
     com5.setCommId("005");
     com5.setCommName("朱家庄新村");
     com5.setCommManager("大漠");
     com5.setCommArea("金阊区");
     com5.setCommStatue("可放装");
     com5.setPermeability(65);
     com5.setUserCount(225);
         setCommArr(new CommunityEntity[]{com1,com2,com3,com4,com5});
    }
public void setCommArr(CommunityEntity[] commArr) 
{
this.commArr = commArr;
}
public CommunityEntity[] getCommArr()
{
return commArr;
}
    
现在我要写一个方法，删除指定的某条记录，要如何实现？import java.util.Scanner;import User.DbStore;public class CommunityManager 
{
public static void main(String args[])
{
delete();
}
public static void delete()
{
DbStore abcd = new DbStore();
Scanner scan = new Scanner(System.in);
System.out.println("请输入要删除的社区编号");
String deletingId = scan.next();
boolean judge = false;
for(int i=0;i<abcd.getCommArr().length;i++)
{
if(abcd.getCommArr()[i].getCommId().equals(deletingId))
{
System.out.println("您要删除的社区编号是："+deletingId);
judge = true;
break;
}
}
if(!judge)
{
System.out.println("该社区不存在！");
}
}
}

Answer 1

你可以不使用数组来保存JavaBean而是用List 这是JAVA推荐的解决方案，删除会很方便如果一定要用数组或者返回数组，那么也用List最后转换为数组就OK了你这里使用数组又回到C语言的时代了，删除一个数组元素 你是要后面元素全部前移么？还是只是做个标记删除？如果是前者那就费事了，后者你设置那个元素内容为null做个标记就OK

Answer 2

数组不可以删除。你可以用list或者用node实现链表。

Answer 3

import java.util.Arrays;public class Test {

public int[] remove(int[] array,int index){
int[] temp=new int[array.length-1];
System.arraycopy(array, 0, temp, 0, index);
System.arraycopy(array, index+1, temp, index, array.length-1-index);
return temp;
}

public static void main(String[] args) {
int[] array={2,5,3,7,4};
int[] temp=new Test().remove(array, 3);
System.out.println(Arrays.toString(temp));
}
}
打印结果是：[2, 5, 3, 4]

Answer 4

package com.commd;public class CommunityManager {
private CommunityEntity[] commArr;
private int len=0;

 public CommunityManager(int max) //初始化用户实体数组
    {
  commArr=new CommunityEntity[max];
        CommunityEntity com1 = new CommunityEntity();
        com1.setCommId("001");
        com1.setCommName("新升新苑");
        com1.setCommManager("大漠");
        com1.setCommArea("高新区");
        com1.setCommStatue("可放装");
        com1.setPermeability(61);
        com1.setUserCount(221);
        insert(com1);
        
        CommunityEntity com2 = new CommunityEntity();
        com2.setCommId("002");
        com2.setCommName("新盛花园");
        com2.setCommManager("大漠");
        com2.setCommArea("吴中区");
        com2.setCommStatue("可放装");
        com2.setPermeability(62);
        com2.setUserCount(222);
        insert(com2);
        
        CommunityEntity com3 = new CommunityEntity();
        com3.setCommId("003");
        com3.setCommName("新唯家园");
        com3.setCommManager("大漠");
        com3.setCommArea("工业园区");
        com3.setCommStatue("可放装");
        com3.setPermeability(63);
        com3.setUserCount(223);
        insert(com3);
        
        CommunityEntity com4 = new CommunityEntity();
        com4.setCommId("004");
        com4.setCommName("蠡东花园");
        com4.setCommManager("大漠");
        com4.setCommArea("相城区");
        com4.setCommStatue("可放装");
        com4.setPermeability(64);
        com4.setUserCount(224);
        insert(com4);
        
        CommunityEntity com5 = new CommunityEntity();
        com5.setCommId("005");
        com5.setCommName("朱家庄新村");
        com5.setCommManager("大漠");
        com5.setCommArea("金阊区");
        com5.setCommStatue("可放装");
        com5.setPermeability(65);
        com5.setUserCount(225);
        insert(com5);
//          setCommArr(new CommunityEntity[]{com1,com2,com3,com4,com5});
    }
    public void setCommArr(CommunityEntity[] commArr) 
    {
        this.commArr = commArr;
    }
    public CommunityEntity[] getCommArr()
    {
        return commArr;
    }
    
public void insert(CommunityEntity value)
{
commArr[len++]=value;
}
    
    public void deleteCommunityById(String commId)
    {
     for(int i=0;i<len;i++)
     {
     CommunityEntity ce=commArr[i];
     if(ce.getCommId().equals(commId))
     {
     for(int k=i;k<len;k++)
{
     commArr[i]=commArr[i+1];
}
len--;
return;
     }
    
    
     }
    
    }
    
    public void showCommunity()
    {
     for(int i=0;i<len;i++)
     {
     CommunityEntity ce=commArr[i];
     System.out.println(ce.getCommId()+" "+ce.getCommName());
     }
    }
    public static void main(String[] args) {
     CommunityManager cm=new CommunityManager(5);
     cm.deleteCommunityById("001");
     cm.showCommunity();
}
}

Answer 5

package com.commd;public class CommunityManager {
private CommunityEntity[] commArr;
private int len=0;

 public CommunityManager(int max) //初始化用户实体数组
    {
  commArr=new CommunityEntity[max];
        CommunityEntity com1 = new CommunityEntity();
        com1.setCommId("001");
        com1.setCommName("新升新苑");
        com1.setCommManager("大漠");
        com1.setCommArea("高新区");
        com1.setCommStatue("可放装");
        com1.setPermeability(61);
        com1.setUserCount(221);
        insert(com1);
        
        CommunityEntity com2 = new CommunityEntity();
        com2.setCommId("002");
        com2.setCommName("新盛花园");
        com2.setCommManager("大漠");
        com2.setCommArea("吴中区");
        com2.setCommStatue("可放装");
        com2.setPermeability(62);
        com2.setUserCount(222);
        insert(com2);
        
        CommunityEntity com3 = new CommunityEntity();
        com3.setCommId("003");
        com3.setCommName("新唯家园");
        com3.setCommManager("大漠");
        com3.setCommArea("工业园区");
        com3.setCommStatue("可放装");
        com3.setPermeability(63);
        com3.setUserCount(223);
        insert(com3);
        
        CommunityEntity com4 = new CommunityEntity();
        com4.setCommId("004");
        com4.setCommName("蠡东花园");
        com4.setCommManager("大漠");
        com4.setCommArea("相城区");
        com4.setCommStatue("可放装");
        com4.setPermeability(64);
        com4.setUserCount(224);
        insert(com4);
        
        CommunityEntity com5 = new CommunityEntity();
        com5.setCommId("005");
        com5.setCommName("朱家庄新村");
        com5.setCommManager("大漠");
        com5.setCommArea("金阊区");
        com5.setCommStatue("可放装");
        com5.setPermeability(65);
        com5.setUserCount(225);
        insert(com5);
//          setCommArr(new CommunityEntity[]{com1,com2,com3,com4,com5});
    }
    public void setCommArr(CommunityEntity[] commArr) 
    {
        this.commArr = commArr;
    }
    public CommunityEntity[] getCommArr()
    {
        return commArr;
    }
    
public void insert(CommunityEntity value)
{
commArr[len++]=value;
}
    
    public void deleteCommunityById(String commId)
    {
     int i;
     for(i=0;i<len;i++)
     {
     CommunityEntity ce=commArr[i];
     if(ce.getCommId().equals(commId))
     {
     break;
     }
     }
    
     for(int k=i;k<len-1;k++)
{
     commArr[k]=commArr[k+1];
}
len--;
return;
    
    }
    
    public void showCommunity()
    {
     for(int i=0;i<len;i++)
     {
     CommunityEntity ce=commArr[i];
     System.out.println(ce.getCommId()+" "+ce.getCommName());
     }
    }
    public static void main(String[] args) {
     CommunityManager cm=new CommunityManager(5);
     cm.deleteCommunityById("002");
     cm.showCommunity();
}
}
前面代码有点问题，重新调整过

Answer 6

list是一个集合，和数组相似，通过add和remove方法，可以很方便的增删元素。

Answer 7

把数组转换成LIST  然后重新创建一个List  进行删除操作 最后把List再转回数组仅供参考：
String [] strs = new String[]{"1","2","3","4"};
@SuppressWarnings("rawtypes")
List list = Arrays.asList(strs);
@SuppressWarnings("rawtypes")
List list2 = new ArrayList<String>(list);
list2.add("1");
System.out.println(list2);
@SuppressWarnings("unused")
Object[] str2 = list2.toArray();
String str3 = (String) str2[0];
System.out.println(str3);

Answer 8

各位大大，你们的话我都研究了，最后我用的是标记删除，这个方法不是最好的但是对我这个阶段来说很合适，同时感谢zhucb2010，sasuke38，Rolos，代码我记下来了，以后再研究，真心感谢！
if(abcd.getCommArr()[i].getCommId().equals(deletingId))
{
System.out.println("您要删除的社区编号是："+deletingId);
abcd.getCommArr()[i].setCommId(null);
abcd.getCommArr()[i].setCommName(null);
abcd.getCommArr()[i].setCommManager(null);
abcd.getCommArr()[i].setCommArea(null);
abcd.getCommArr()[i].setCommStatue(null);
abcd.getCommArr()[i].setPermeability(0);
abcd.getCommArr()[i].setUserCount(0);
System.out.println("删除成功！");
System.out.println("该区域的社区信息如下："+"\n");
System.out.println("小区编号"+"\t\t"+"小区名称"+"\t\t"+"小区经理"+"\t\t"+"区域"+"\t\t"+"小区状态"+"\t\t"+"渗透率"+"\t\t"+"覆盖用户数");
System.out.println("----------------------------------------------------------------------------------------------------------");
System.out.println(abcd.getCommArr()[i].getCommId()+"\t\t"+abcd.getCommArr()[i].getCommName()+"\t\t"+abcd.getCommArr()[i].getCommManager()+"\t\t"+abcd.getCommArr()[i].getCommArea()+"\t\t"+abcd.getCommArr()[i].getCommStatue()+"\t\t"+abcd.getCommArr()[i].getPermeability()+"%"+"\t\t"+abcd.getCommArr()[i].getUserCount());
judge = true;
break;
}

Answer 9

http://blog.csdn.net/mengxiangyue/article/details/6876768看看这个 推荐使用集合类