130_StringBuilder和String相互转换
1 package StringBuilder; 2 /* 3 StringBuilder 转换为 String 4 public String toString(): 通过toString() 就可以实现把StringBuilder 转换为 String 5 6 String转换为 StringBuilder 7 public StringBuilder(String s): 通过构造方法就可以实现把String转换为 StringBuilder 8 */ 9 10 public class StringBuilderDemo03 { 11 public static void main(String[] args) { 12 //StringBuilder 转换为 String 13 // StringBuilder sb = new StringBuilder(); 14 // sb.append("hello"); 15 16 // public String toString(): 通过toString() 就可以实现把StringBuilder 转换为 String 17 // String s = sb.toString(); 18 // System.out.println(s); 19 20 // String转换为 StringBuilder 21 String s = "hello"; 22 23 // public StringBuilder(String s): 通过构造方法就可以实现把String转换为 StringBuilder 24 StringBuilder sb = new StringBuilder(s); 25 26 System.out.println(sb); 27 28 } 29 }