数组转字符串

Question

String   a[]   =   {"1","2","3","4","5"}
转成
String   b= "1,2,3,4,5" 
new String跟toString
两个都报错？

Answer 1

肯定不行啦
用这个方法
StringBuilder sb = new StringBuilder();
for(int i=0;i<a.length;i++){
   sb.append(a[i]);
   if(i!=a.length){
     ab.append(",");
   }
}
sb.toString();
就可以了

Answer 2

        String a[] = {"1","2","3","4","5"};
     String b="";
     for(int i=0;i<(a.length);i++){
     b += (a[i]+", ");
     }

Answer 3

        String a[] = {"1","2","3","4","5"};
     String b="";
     for(int i=0;i<a.length;i++){
     b += (a[i]+", ");
     }

Answer 4

String a[] = {"1","2","3","4","5"};
StringBuffer b=new StringBuffer();
for(int i=0;i<a.length-1;i++){
b.append (a[i]+", ");
}
b.append(a[a.length-1]);
此答案应更好

Answer 5

String a[] = {"1","2","3","4","5"};
return "\"" + Arrays.toString(a).substring(1, Arrays.toString(a).length()-1) + "\"";

Answer 6

如果你理解String你就觉得这种做法是效率最低的..

Answer 7

学习了...呵呵一下子忽略了Arrays,不过只有在JDK1.6的版本中才可以使用.而且觉得根据他的意思,前面和后面的"(双引号)是不需要的了,

Answer 8

见识了  虽然有JDK6 但一直没用 新特性也不了解 呵呵

Answer 9

String a[] = {"1","2","3","4","5"};
System.out.println(Arrays.toString(a).replaceAll("\\[|\\]","\""));