Java StringBuffer類

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 1 package demo03; 2  3 public class StringBufferDemo { 4     public static void main(String[] args) { 5         func(); 6     } 7      8     public static void func() { 9         StringBuffer buffer = new StringBuffer();10         buffer.append("abcd").append(1);11         System.out.println(buffer);    //abcd112         13         buffer.delete(1, 3);14         System.out.println(buffer);    //ad115         16         buffer.insert(1, "123");17         System.out.println(buffer);    //a123d118         19         buffer.replace(1, 4, "jdk");20         System.out.println(buffer);    //ajdkd121         22         buffer.reverse();23         System.out.println(buffer);    //1dkdja24         25         String s = buffer.toString();26         System.out.println(s);        //1dkdja27         28     }29 }

demo

 1 package demo03; 2  3 public class StringBufferTest { 4     //{1,2,3,4,5} => [1,2,3,4,5] 5     public static void main(String[] args) { 6         int[] arr = {1,2,3,4,5}; 7         System.out.println(toString(arr)); 8     } 9     10     public static String toString(int[] arr) {11         StringBuffer buffer = new StringBuffer();12         buffer.append("[");13         for (int i = 0; i < arr.length; i++) {14             if (i == arr.length - 1) {15                 buffer.append(arr[i]).append("]");16             } else {17                 buffer.append(arr[i]).append(",");18             }19         }20         21         return buffer.toString();22     }23     24 }

 

Java StringBuffer類