StringBuffer
1 package Z3_2_j6; 2 3 public class TestStringBuffer { 4 public static void main(String[] args) { 5 String ser ="abd"; 6 String str2=new String();//创建一个字符串类的对象 7 String str3=new String("qwe");//构造方法创建 8 StringBuffer sb=new StringBuffer(); 9 StringBuffer sb2=new StringBuffer("asd");//构造方法创建 10 StringBuffer sb3=new StringBuffer("asd");//构造方法创建 11 StringBuffer strb =sb.append("qwe");//拼接 12 sb.append(true); 13 sb.append("asd"); 14 System.out.println(strb); 15 System.out.println(sb2.equals(sb3));//不能直接对比需要头String 16 System.out.println(sb2.toString().equals(sb3.toString()));//不能直接对比需要头String 17 } 18 19 20 }