java如何在安卓中从主字符串中获取特定字符串？

Question

如何获取字符串中第二个逗号（，）之前的字符串

例如：

String a="abcd,efg,hij,klm";

我想得到像abcd,efg这样的输出

Answer 1

试着做如下事情

String[] splitedString = a.split(",");
String output = splitedString[0] + "," + splitedString[1];

Answer 2

试试这个：

String[] array = a.split(",");
String value = array[0] + ","+ array[1];

Answer 3

试着做：

String[] arr = a.split(",");     
String str = arr[0] + "," + arr[1];

Answer 4

我还没有测试过这段代码，但是您可以使用

private String GetFirstSplitN(String str,int n,String splitUsing)
{
    StringBuilder sb=new StringBuilder();
    String []temp=str.split(splitUsing);

    for(int i=0;i<n;i++)
    {
        if(sb.length>0)sb.append(splitUsing);
        sb.append(temp[i]);
    }

    return sb.toString();      
}

然后

String a="abcd,efg,hij,klm";
String str=GetFirstSplitN(a,2,",");

Answer 5

String[] split = a.split(",");
String beforeSecond = a[0] + "," + a[1];
String afterSecond = a[2] + "," + a[3];

Answer 6

可以将重载方法^{}与^{}方法结合使用

String b = a.substring(0, a.indexOf(',', a.indexOf(',')+1));

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a.indexOf(',', a.indexOf(',')+1)返回字符串中第二个逗号的索引