Java StringBuffer/StringBuilder（字符串拼接）

 StringBuffer/StringBuilder

public class Test1 {public static void main(String[] args) {String s1 = "Hello";StringBuffer stringBuffer = new StringBuffer(s1); //创建StringBuffer对象stringBuffer.append("world").append("!");// 再转换为字符串String s2 = stringBuffer.toString();System.out.println(s2);}}

未完待续