Java Basics Hardening the case of a 45:stringbuffer class to stitch an array into a string of a specified format

1. First look at the case code as follows:

1  Packagecn.itcast_07;2 3 /*4 * Stitch the array into a string5  */6  Public classStringBufferTest2 {7      Public Static voidMain (string[] args) {8         //define an array9         int[] arr = {44, 33, 55, 11, 22 };Ten  One         //Defining features A         //Mode 1: Use String to stitch the way -String S1 =arraytostring (arr); -System.out.println ("S1:" +s1); the  -         //Way 2: Use StringBuffer to do the stitching way -String s2 =arrayToString2 (arr); -System.out.println ("S2:" +S2); +     } -  +     //the way to do stitching with StringBuffer A      Public StaticString ArrayToString2 (int[] arr) { //Always use a StringBuffer string buffer object, saving memory overhead  atStringBuffer SB =NewStringBuffer (); -  -Sb.append ("["); -          for(intx = 0; x < arr.length; X + +) { -             if(x = = Arr.length-1) { - sb.append (arr[x]); in}Else { -Sb.append (Arr[x]). Append (","); to             } +         } -Sb.append ("]"); the  *         returnsb.tostring (); $     }Panax Notoginseng  -     //use String to stitch the way the      Public StaticString arraytostring (int[] arr) { //open up multiple string constant memory, wasting overhead  +String s = ""; A  thes + = "["; +          for(intx = 0; x < arr.length; X + +) { -             if(x = = Arr.length-1) { $s + =Arr[x]; $}Else { -s + =Arr[x]; -s + = ","; the             } -         }Wuyis + = "]"; the  -         returns; Wu     } -}

The results of the operation are as follows:

Java Basics Hardening the case of a 45:stringbuffer class to stitch an array into a string of a specified format