Converts a set or array to a String string.

Converts a set or array to a String string.

1. Convert the set to a String

String s="";for (int i = 0; i < numList.size(); i++) {    if (s=="") {s=numList.get(i);    }else {s=s+","+numList.get(i);    }}

 

• Define a List set, for example:

List<String> numList=new ArrayList<String>();for(int i=1; i<10; i++){   numList.add(String.valueOf(i));     }

• Define String s = "" to cyclically store the value retrieved from numList.
• Output result (with "," in the middle of the character) such as: s =, 1, 2, 3, 4, 5, 6, 7, 8, 9
• Output result (no interval between characters) such as: s = 123456789
• String. valueOf () This method can convert a non-String value to a String value.

 

2. Convert the array to a String.

String [] arr = {"abc", "123", "@#&"};StringBuffer sb = new StringBuffer();for(int i = 0; i < arr.length; i++){sb. append(arr[i]);}String ns = sb.toString();System.out.println(ns);}

• The displayed result is abc123 @#&
• You can use the String. valueOf () method to convert a non-String value to a String value. An int array is also available. Example: sb. append (String. valueOf (arr [I]);