java值传递面试题2

1.
public class Test {
public static void test(StringBuffer str){
str.append(",World!");
}
public static void main(String[] args)
{
StringBuffer string = new StringBuffer("Hello");
test(string);
System.out.println(string);
}

}

输出结果 Hello,World.

2.

public class Test {
public static void test(String str){
str="World";
}
public static void main(String[] args){
String string = "Hello";
test(string);
System.out.println(string);

}
}

输出结果： Hello