java找不到符号的问题

答案:5 悬赏:50

解决时间 2021-02-17 23:32

提问者网友：niaiwoma
2021-02-17 00:54

java找不到符号的问题

最佳答案

二级知识专家网友：底特律间谍
2021-02-17 02:23

你把zeroException和A俩个类定义到Shiyan8_7 类外边，没你这样的写法，内部类也不是这样写的，
public class Shiyan8_7 {
public static void main(String args[]) {
A a = new A();
int b;
Scanner reader = new Scanner(System.in);
b = reader.nextInt();
try {
a.f(b);
} catch (zeroException x) {
System.out.println(x.getMessage());
}

}
}
class zeroException extends Exception {
String message;

zeroException(int n) {
message = n + "不是正数";
}

public String getMessage() {
return message;
}
}
class A {
public void f(int m) throws zeroException {
if (m < 0) {
zeroException ex = new zeroException(m);
throw (ex);
}
double number = Math.sqrt(m);
System.out.println(m + "的平方根是" + number);
}
}

全部回答

1楼网友：不想翻身的咸鱼
2021-02-17 06:12

修改了一下：import java.util.Scanner;
public class Shiyan8_7 {
    public static void main(String args[]) {
        A a = new A();
        int b;
        Scanner reader = new Scanner(System.in);
        b = reader.nextInt();
        try {
            a.f(b);
        } catch(zeroException x) {
            System.out.println(x.getMessage());
        }
    }
}
//放到外面来
class zeroException extends Exception {
    String message;
    zeroException(int n) {
        message = n + "不是正数";
    }
    public String getMessage() {
        return message;
    }
}
class A {
    public void f(int m) throws zeroException {
        if(m<0) {
            zeroException ex = new zeroException(m);
            throw(ex);
        }
        double number = Math.sqrt(m);
        System.out.println(m+"的平方根是" + number);
    }
}

2楼网友：爱难随人意
2021-02-17 04:45

你把zeroException类放在了Shiyan8_7类里面了。

这主要是你写代码不规范造成的。
下面是正确的：public class Shiyan8_7 {
    public static void main(String[] args) {
        A a=new A();
        int b;
        Scanner reader= new Scanner(System.in);
        b=reader.nextInt();
        try{
            a.f(b);
        }catch(zeroException x){
            System.out.println(x.getMessage());
        }
    }
}
class zeroException extends Exception{
    String message;
    zeroException(int n){
        message=n+"不是正数";
    }
    public String getMessage(){
        return message;
    }
}
class A{
    public void f(int m) throws zeroException{
        if(m<0){
            zeroException ex=new zeroException(m);
            throw(ex);
        }
        double number=Math.sqrt(m);
        System.out.println(m+"的平方根是"+number);
    }
}

3楼网友：舊物识亽
2021-02-17 03:54

大括号不匹配，改成：
import java.util.Scanner;
public class Shiyan8_7{
public static void main(String args[]){
A a=new A();
int b;
Scanner reader= new Scanner(System.in);
b=reader.nextInt();
try{
a.f(b);
}
catch(zeroException x){
System.out.println(x.getMessage());
}
}
}
class zeroException extends Exception{
String message;
zeroException(int n){
message=n+"不是正数";
}
public String getMessage(){
return message;
}
}
class A{
public void f(int m) throws zeroException{
if(m<0){
zeroException ex=new zeroException(m);
throw(ex);
}
double number=Math.sqrt(m);
System.out.println(m+"的平方根是"+number);
}
}

4楼网友：鸠书
2021-02-17 03:46

import java.util.Scanner;
public class Shiyan8_7{
public static void main(String args[]){
A a=new A();
int b;
Scanner reader= new Scanner(System.in);
b=reader.nextInt();
try{
a.f(b);
}
catch(zeroException x){
System.out.println(x.getMessage());
}
}
}

class zeroException extends Exception{
String message;
zeroException(int n){
message=n+"不是正数";
}
public String getMessage(){
return message;
}
}
class A{
public void f(int m) throws zeroException{
if(m<0){
zeroException ex=new zeroException(m);
throw(ex);
}
double number=Math.sqrt(m);
System.out.println(m+"的平方根是"+number);
}
}
把最下面的两个括号移到两个类的上面

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