public class part2di5ti {
String s = "Hello, World!";
int storage(String s) {
return s.length() * 2;
}
/* void print() {
System.out.println(
"storage(s) = " + storage(s));
}*/
public static void main(String[] args) {
part2di5ti st = new part2di5ti();
// st.print();
System.out.println(st.storage(s));
}
}
这么写为什么会出错？
part2di5ti.java:13: non-static variable s cannot be referenced from a static context
System.out.println(st.storage(s));
注示的写法与我写的有什么不同?

MAIN里调的方法都得是静态的吗?
这里还是有点乱

public class part2di5ti {
static String s = "Hello, World!";//在定义字符串时,应该声明为static
int storage(String s) {
return s.length() * 2;
}
void print() {
System.out.println("storage(s) = " + storage(s));
}
public static void main(String[] args) {
part2di5ti st = new part2di5ti();
st.print();
System.out.println(st.storage(s));
}
}

MAIN里调的方法不一定都得是静态的.非静态的方法可通过创建对象
实例,声明引用变量来调用方法.但是静态方法调用成员变量时须是静态成员.

[此贴子已经被作者于2007-6-2 8:58:19编辑过]