public class StringBufferDemo {
public static void main(String[] args) {
String s1 = "hello";
String s2 = "world";
System.out.println(s1 + "---" + s2);
change(s1, s2);
System.out.println(s1 + "---" + s2);
StringBuffer sb1 = new StringBuffer("hello");
StringBuffer sb2 = new StringBuffer("world");
System.out.println(sb1 + "---" + sb2);
change(sb1, sb2);
System.out.println(sb1 + "---" + sb2);
}
public static void change(StringBuffer sb1, StringBuffer sb2){
sb1 = sb2;
sb2.append(sb1);
}
public static void change(String s1, String s2) {
s1 = s2;
s2 = s1 + s2;
}
} |