Question

我正在尝试取一整个字符串，并使用索引来打印不同的每个部分。我一直在尝试这样的事情......

String example = "one, two, three, four"
int comma = example.indexOf(',' , 0);
    String output = example.substring(comma);
    System.out.println(output);

打印

,two,three,four

我无法做任何其他事情......

Answer 1

仅使用indexOf loop方法，您可以打印以逗号String分隔的所有单独的,。你不需要split正则表达式。请看下面的例子。

    String str = "one, two, three, four";
    int lastIndex = 0;
    int firstIndex=0;
    while (lastIndex != -1) {

        lastIndex = str.indexOf(',', lastIndex);

        if (lastIndex != -1) {
            System.out.print(str.substring(firstIndex, lastIndex));

            if(lastIndex==str.lastIndexOf(',')){
            System.out.print(str.substring(lastIndex));
            }
            lastIndex += 1;
        }

        firstIndex=lastIndex;
    }
    System.out.println();

输出：一二三四

Answer 2

试试这个：

String example = "one, two, three, four";

for (int i = example.indexOf(", "); i != -1; i = example.indexOf(", ")) {
    System.out.println(example.substring(0, i));
    example = example.substring(i + 2);
}
System.out.println(example);

如果你喜欢递归：

public static void main(String[] args) {
    String example = "one, two, three, four";
    printSections(example);
}

public static void printSections(String word) {
    int i = word.indexOf(", ");
    if (i == -1) System.out.println(word);
    else {
        System.out.println(word.substring(0, i));
        printSections(word.substring(i + 2));
    }
}

Answer 3

为什么不试试split()？

String example = "one, two, three, four"
String[] temp = example.split(",");
for(int i=0;i<temp.length; i++){
System.out.println(temp[i]);
}

Answer 4

String类中有一个方便的方法。 Sting#split

你只需用逗号分割你的字符串，这就是你所需要的。

String example = "one, two, three, four";
String[] split = example.split(",");
for (String string : split) {
    System.out.println(string);
}

split方法返回分隔符和字符串的array，我们只需要打印它们。

旁注：我使用了Enhanced for loop to iterate

Answer 5

使用拆分

String example = "one, two, three, four";
    for(String i:example.split(",")){
        System.out.println(i);

    }

使用IndexOf

    String example = "one, two, three, four";
    String output;
    String temp = example;
    int gIndex = 0;
    int len = example.length();
    example += ",";
    for(int i=0 ; i<len;i+=gIndex+1){
        gIndex = example.indexOf(",");
        output = example.substring(0,gIndex);
        System.out.println(output);
        example = example.replace(output, "").replaceFirst(",", "");
    }
    example = temp;

Answer 6

喜欢这个

String example = "one, two, three, four"
String[] output = example.split(',');
for(String s:output){  
    System.out.println(s);
}

分离索引为的String

6 个答案: