将多个多维数组合并

[tonyliuchenjun]

例如
java.util.Map president1 = new java.util.HashMap();
president1.put("200801", "as");
president1.put("200802", "as12");
president1.put("200803", "as3123");
president1.put("200804", "as342");

java.util.Map president2 = new java.util.HashMap();
president2.put("200801", "as2");
president2.put("200802", "as1234");
president2.put("200803", "as312323");
president2.put("200804", "as3fd42");

java.util.Map president3 = new java.util.HashMap();
president3.put("200801", "as3");
president3.put("200802", "as1sdf234");
president3.put("200803", "as3df12323");
president3.put("200804", "as3fsdfd42");

合并成 ("200801", "as","as2","as3");
将 president1 ，president2 ，president3 合并成一个数组怎么做 请告诉我谢谢

[qybao]

for example

Map tmp = new java.util.HashMap();
Iterator it = president1.entrySet().iterator();
while (it.hasNext()) {
    Map.Entry entry = (Map.Entry)it.next();
    List l = tmp.get(entry.getKey());
    if (l == null) {
        l = new ArrayList();
    }
    l.add(entry.getValue());
    tmp.put(entry.getKey(), l);
}

it = president2.entrySet().iterator();
while (it.hasNext()) {
    Map.Entry entry = (Map.Entry)it.next();
    List l = tmp.get(entry.getKey());
    if (l == null) {
        l = new ArrayList();
        l.add(null);
    }
    l.add(entry.getValue());
    tmp.put(entry.getKey(), l);
}

it = president3.entrySet().iterator();
while (it.hasNext()) {
    Map.Entry entry = (Map.Entry)it.next();
    List l = tmp.get(entry.getKey());
    if (l == null) {
        l = new ArrayList();
        l.add(null);
        l.add(null);
    }
    l.add(entry.getValue());
    tmp.put(entry.getKey(), l);
}

String[][] result = new String[tmp.size()][4];
it = tmp.entrySet().iterator();
int index = 0;
while (it.hasNext()) {
    Map.Entry entry = (Map.Entry)it.next();
    result[index][0] = (String)entry.getKey();
    List l = (List)entry.getValue();
    result[index][1] = (String)l.get(0);
    result[index][2] = (String)l.get(1);
    result[index][3] = (String)l.get(2);
    index++;
}

for (int i=0; i<result.length; i++) {
    for (int j=0; j<result[i].length-1; j++) {
        System.out.print(result[i][j]+",");
    }
    System.out.println(result[i][result[i].length-1]);
}

[forestking_xx]

我不是很明白你的意思，是不是不让"200801"作为键，后面的三个作为值，类似map的形式存下来？
如果这样的话，java本身不提供这样的实现吧，不过可以自己写个类，里面包含四个属性，第一个作为键，后面三个作为值，然后把它们存在一个list里，
或者按照二维数组的形式存，不过要使用的时候，自己的按照键值对的形式解析数组。

[火龙果被占用了]

import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class Test {

    public static void main(String[] args) {
        Map<String, String> president1 = new HashMap<String, String>();
        president1.put("200801", "as");
        president1.put("200802", "as12");
        president1.put("200803", "as3123");
        president1.put("200804", "as342");
        Map<String, String> president2 = new HashMap<String, String>();
        president2.put("200801", "as2");
        president2.put("200802", "as1234");
        president2.put("200803", "as312323");
        president2.put("200804", "as3fd42");
        Map<String, String> president3 = new HashMap<String, String>();
        president3.put("200801", "as3");
        president3.put("200802", "as1sdf234");
        president3.put("200803", "as3df12323");
        president3.put("200804", "as3fsdfd42");
        
        List<String[]> list = new ArrayList<String[]>();
        for(Map.Entry<String, String> entry : president1.entrySet()) {
            String[] str = new String[4];
            str[0] = entry.getKey();
            str[1] = president1.get(str[0]);
            str[2] = president2.get(str[0]);
            str[3] = president3.get(str[0]);
            list.add(str);
        }
        
        for(String[] s : list) {
            System.out.println(Arrays.toString(s));
        }        
    }
}

[changjiangzhibin]

遍历，存到一个新的集合中

[火龙果被占用了]

重新改进了一下：

import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class Test {

    public static void main(String[] args) {               
        Map<String, String> president1 = new HashMap<String, String>();
        president1.put("200801", "as");
        president1.put("200802", "as12");
        president1.put("200803", "as3123");
        president1.put("200804", "as342");
        
        Map<String, String> president2 = new HashMap<String, String>();
        president2.put("200801", "as2");
        president2.put("200802", "as1234");
        president2.put("200803", "as312323");
        president2.put("200804", "as3fd42");
        
        Map<String, String> president3 = new HashMap<String, String>();
        president3.put("200801", "as3");
        president3.put("200802", "as1sdf234");
        president3.put("200803", "as3df12323");
        president3.put("200804", "as3fsdfd42");        
        
        // 增加部分
        List<Map<String, String>> mapList = new ArrayList<Map<String, String>>();
        mapList.add(president1);
        mapList.add(president2);
        mapList.add(president3);
        // end
        
        List<String[]> list = new ArrayList<String[]>();
        for(Map.Entry<String, String> entry : president1.entrySet()) {
            String[] str = new String[mapList.size() + 1];
            str[0] = entry.getKey();
            int i = 1;
            for(Map<String, String> president : mapList) {
                str[i++] = president.get(str[0]);
            }            
            list.add(str);
        }
        
        for(String[] s : list) {
            System.out.println(Arrays.toString(s));
        }        
    }
}

[tang521jing]

请问你最后解决了吗？？？、、、