Java集合-如何在集合中添加多个值？

Question

How to add multiple values into multihashmap, since its not genric.Please see the below code.

Please look it expected output : Col1,col2,col3,col4 order of display values not matching with col5 order. Could you please advise me to handle all the values within multihashmap.

Iterator<Search> iterator = pre.iterator();
    MultiHashMap mhm = new MultiHashMap();
    StringBuilder sb = new StringBuilder();
    List list = null;
    while(iterator.hasNext())       {
        Search prer = (Search)iterator.next();
        String product = prer.getProduct();
        sb.append(prer.getreqsNbr());
        sb.append(" ");
        sb.append(prer.getOp()));
        sb.append(" ");
        dependencies.put(product, sb.toString());
        sb.setLength(0);

        ***//This is for col1,col2,col3,col4***

        prer.getProductNbr()));
        prer.getProdDescr()));
        prer.getreqsNbr()));
        prer.getreqdescr()));
        }

    ***//This loop for get values as col5***

    Set set = mhm.entrySet();  
    Iterator i = set.iterator(); 
    while(i.hasNext()) { 
        Map.Entry me = (Map.Entry)i.next(); 
        list=(List)mhm.get(me.getKey()); 
        int itemCount = list.size();
        for (int z = 0; z < itemCount; z++) {
            String values = "";
            for(int j=0;j<list.size();j++)  { 
                values += list.get(j);      }
            System.out.println(me.getKey() + ": value :" + values); 
         }

Above program output:

c1   c2    c3  c4 c5
120  xxxx  12 xxx 14
120  xxxx  13 xxx 14
120  xxxx  14 xxx 14
130  xxxx  14 xxx 12 13 14

Expected output :

Col1  col2   col3  col4    col5
120   xxxx    12   xxxx    12 13 14
120   xxxx    13   xxxx    12 13 14     
120   xxxx    14   xxxx    12 13 14
130   xxxx    14   xxxx    14 

Below setof code is working as expected(this for col5).

Set set = mhm.entrySet();  
    Iterator i = set.iterator(); 
    while(i.hasNext()) { 
        Map.Entry me = (Map.Entry)i.next(); 
        list=(List)mhm.get(me.getKey()); 
        int itemCount = list.size();
        for (int z = 0; z < itemCount; z++) {
            String values = "";
            for(int j=0;j<list.size();j++)  { 
                values += list.get(j);      }
            System.out.println(me.getKey() + ": value :" + values); 
         }

This part need to push multihash map and while displaying those are asociated each other (this is for col1,col2,col3,col4.

prer.getProductNbr()));
prer.getProdDescr()));
prer.getreqsNbr()));
prer.getreqdescr()));

Answer 1

This code will print the values many times

    int itemCount = list.size();
    for (int z = 0; z < itemCount; z++) {
        String values = "";
        for(int j=0;j<list.size();j++)  { 
            values += list.get(j);
        }
        System.out.println(me.getKey() + ": value :" + values); 
     }

You probably want something like this:

String values = "";
for(int j=0;j<list.size();j++)  { 
  values += list.get(j) + " ";
}
System.out.println(me.getKey() + ": value :" + values);