import java.io.*;
class Master {
String doFileStuff() throws FileNotFoundException { return "a"; }
}
class Slave extends Master {
public static void main(String[] args) {
String s = null;
try {
s = new Slave().doFileStuff();
} catch ( Exception x) {
s = "b";
}
System.out.println(s);
}
// insert code here
} Which, inserted independently at // insert code here, will compile,
and produce the output b? (Choose all that apply.) A. String doFileStuff() { return "b"; } B. String doFileStuff() throws IOException ( return "b"; } C. String doFileStuff(int. x) throws IOException ( return "b"; } D. String doFileStuff() throws FileNotFoundException { return "b"; } E. String doFileStuff() throws NumberFormatException { return "b"; } F. String doFileStuff() throws NumberFormatException, FileNotFoundException { return "b"; }
答案 给的是 A D E F 小弟 刚学 java 大侠们帮忙啊 B为什么不对啊 请大家帮忙啊 也希望有人 给的回答 详细点 让小弟 多学些知识谢谢啊 分不是很多 大家见谅啊 呵呵
class Master {
String doFileStuff() throws FileNotFoundException { return "a"; }
}
class Slave extends Master {
public static void main(String[] args) {
String s = null;
try {
s = new Slave().doFileStuff();
} catch ( Exception x) {
s = "b";
}
System.out.println(s);
}
// insert code here
} Which, inserted independently at // insert code here, will compile,
and produce the output b? (Choose all that apply.) A. String doFileStuff() { return "b"; } B. String doFileStuff() throws IOException ( return "b"; } C. String doFileStuff(int. x) throws IOException ( return "b"; } D. String doFileStuff() throws FileNotFoundException { return "b"; } E. String doFileStuff() throws NumberFormatException { return "b"; } F. String doFileStuff() throws NumberFormatException, FileNotFoundException { return "b"; }
答案 给的是 A D E F 小弟 刚学 java 大侠们帮忙啊 B为什么不对啊 请大家帮忙啊 也希望有人 给的回答 详细点 让小弟 多学些知识谢谢啊 分不是很多 大家见谅啊 呵呵
IOException 比 FileNotFoundException 要大。所以不能!!
在java里边,子类重写父类的方法,如果父类的方法有抛出异常的语句,子类的方法抛出的异常必须得是
父类抛出异常的子类,或者和父类抛出的一样;
如果父类没有抛出异常,子类也不能抛出异常;