To convert a collection or an array into string strings

1. Turning collections into string strings

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 collection, such as:

List<string> numlist=new arraylist<string> (); for (int i=1; i<10; i++) {   Numlist.add (String.valueOf (i));     }

• Defines a String s= "" to loop through the values traversed from the numlist.
• Output (character Middle plus ",") such as: s=,1,2,3,4,5,6,7,8,9
• Output results (no spacing between characters) such as: s=123456789
• String.valueof () This method converts a value of non-string type to a numeric value of type string.

2. Convert array to string 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);}

• After running the results are displayed as: [Email protected]#&
• Use String.valueof () This method converts a value of non-string type to a numeric value of type string, and an array of type int is also available. Example: Sb.append (string.valueof (arr[i));

To convert a collection or an array into string strings