String和StringBuffer区别

代码

class StringAndStringBuffer {    public void setString(String string) {        string = "A";    }    public void setStringBuffer(StringBuffer stringBuffer) {        stringBuffer.append("A");    }    public static void main(String[] args)     {        StringAndStringBuffer s = new StringAndStringBuffer();        String string = "a";        s.setString(string);        System.out.println(string);        StringBuffer stringBuffer = new StringBuffer("a");        s.setStringBuffer(stringBuffer);        System.out.println(stringBuffer);    }}

运行结果：

D:\>javac StringAndStringBuffer.javaD:\>java StringAndStringBufferaaA