下面这段代码会产生(B )个String对象.String s1 = "hello";String s2 = s1.substring(2,3); String s3 = s1.toString(); String s4 = new StringBuffer(s1).toString(); A、1 B、2 C、3 D、4
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/03 03:07:25
![下面这段代码会产生(B )个String对象.String s1 =](/uploads/image/z/12193270-70-0.jpg?t=%E4%B8%8B%E9%9D%A2%E8%BF%99%E6%AE%B5%E4%BB%A3%E7%A0%81%E4%BC%9A%E4%BA%A7%E7%94%9F%EF%BC%88B+%EF%BC%89%E4%B8%AAString%E5%AF%B9%E8%B1%A1.String+s1+%3D+%22hello%22%3BString+s2+%3D+s1.substring%282%2C3%29%3B+String+s3+%3D+s1.toString%28%29%3B+String+s4+%3D+new+StringBuffer%28s1%29.toString%28%29%3B+A%E3%80%811+B%E3%80%812+C%E3%80%813+D%E3%80%814)
下面这段代码会产生(B )个String对象.String s1 = "hello";String s2 = s1.substring(2,3); String s3 = s1.toString(); String s4 = new StringBuffer(s1).toString(); A、1 B、2 C、3 D、4
下面这段代码会产生(B )个String对象.
String s1 = "hello";
String s2 = s1.substring(2,3);
String s3 = s1.toString();
String s4 = new StringBuffer(s1).toString();
A、1 B、2 C、3 D、4
下面这段代码会产生(B )个String对象.String s1 = "hello";String s2 = s1.substring(2,3); String s3 = s1.toString(); String s4 = new StringBuffer(s1).toString(); A、1 B、2 C、3 D、4
楼上太强了,不得不俯首称赞;
都是变量声明语句嘛;
String s1 = "hello";
String s2 = s1.substring(2,3); 截取第一个字符串
String s3 = s1.toString();
String s4 = new StringBuffer(s1).toString();新建一个Buffer又转为String