求一个小算法

Question

ArrayList s1 = {"合计","常州","淮安","连云港","南京","南通","苏州","宿迁","泰州","无锡","徐州","盐城","扬州","镇江"};
ArrayList s2 = { "合计","扬州" };得到以下结果:
ArrayList s3 ={"合计","","","","","","","","","","","","扬州",""}; 解决立马得分

Answer 1

String[] s1 = {"合计","常州","淮安","连云港","南京","南通","苏州","宿迁","泰州","无锡","徐州","盐城","扬州","镇江"};

String[] s2 = { "合计","扬州" };

String[] s3 = new String[s1.length];
s3[0] = s1[0];

for (int i=1;i<s1.length;i++){
if (s1[i].equals(s2[1])){
s3[i] = s2[1];
}else {
s3[i] = "";
}
}

Answer 2

ArrayList s1 = {"合计","常州","淮安","连云港","南京","南通","苏州","宿迁","泰州","无锡","徐州","盐城","扬州","镇江"};
ArrayList s2 = { "合计","扬州" };
ArrayList s3 = new ArrayList();
for(int i=0,len=s1.size();i<len;i++)
{
    String s1_val = (String)s1.get(i);
    for(int j=0;j<s2.size();j++)
    {
       String s2_val = (String)s2.get(j); 
       if(s1_val.equals(s2_val))
       {
            s3.add(s1_val);
       }
       else
       {
            s3.add("");
       }
    }
}

Answer 3

如果把数组拨成ArrayList如果做?

Answer 4

for(int i=0;i<s1.length;i++){
    for(int j=0;i<s2.length;j++){
        if(s1.get(i)!=null && s1.get(i).equals(s2.get(j))){
            s3.add(s1.get(i));
            break;
        }else{
            s3.add("");
        }
    }
}