StringBuffer片段

//StringBuffer类可以完成字符串的动态添加、插入和替换等操作。

String question = new String("1+1=");
		int answer = 3;
		boolean result = (1+1==3);
		
		StringBuffer sb = new StringBuffer();
		sb.append(question);
		sb.append(answer);
		sb.append(‘\t‘);
		sb.append(result);
		
		System.out.println(sb);
结果为：
1+1=3   false

String   str   =   "中国chinese";  
  for(int   i   =0   ;i   <   str.length()   ;   i   ++)  
  {  
  System.out.println(str.substring(i,   i+1).matches("[\\u4e00-\\u9fa5]+"));  
  }