JAVA FileOutputStream覆盖一些最后的字符

Question

我有一个FileOutputStream和一个类似的cicle：

PrintStream output = new PrintStream(new FileOutputStream("XXXX.json"));

output.print("{\"ObjectsList\": [");

for (int i = 0; i < something.length; i++) { 
     output.print("{"AAAA"},");
}

output.print("]}")

但是在output.print("]}");之前我不需要char ","

如何在EOF-1或EOF-2上写入以覆盖最后一个字符","

Answer 1

在something.length - 1处停止循环并使用output.print("{ AAAA"}");进行最后一次打印调用

Answer 2

   String var = "";
   var = "{\"ObjectsList\": [";

    for (int i = 0; i < something.length; i++) { 
         var = "{"AAAA"},";
    }

    //var.substring(0, var.length()-1) => remove the last char
    output.print(var.substring(0, var.length()-1) + "]}");

Answer 3

尝试如下所示：

 output.println("{\" ObjectsList \": [");
    for(int i=0;i<something.length;i++){
        String out="{\""+i+"}";

        if(i!=something.length-1 ){
            out+=", ";
        }
        output.println(out);
    }
    output.print("]}");