打印arraylist的索引时如何删除最后一个逗号 [英] How to remove the last comma when I print out the index of arraylist

问题描述

List<String> list1 = new ArrayList<String>(words.length);
List<String> list2 = new ArrayList<String>(word.length);    
for(String x: list1){
        for(String y: list2){
            if(x.equalsIgnoreCase(y)){
               System.out.print(list1.indexOf(x) +" "+ ",");
            }
        }
    } 

对于这个函数，运行之后，输出将是 2,5,7....9,我的问题是如何删除最后一个逗号?

For this function, after run it, the output will be 2,5,7....9, My question is how to remove the last comma?

推荐答案

我会在开头打印逗号，像这样 -

I would print the comma at the start, something like this -

boolean first = true;
for(String x: list1){
    for(String y: list2){
        if(x.equalsIgnoreCase(y)){
           if (first) {
               first = false;
           } else {
               System.out.print(", "); // <-- or " ," if you prefer.
           }
           System.out.print(list1.indexOf(x));
        }
    }
}

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