Java face question (05)

1) Design a Java program, customize the Exception class, enter a string from the keyboard, if the string value is "ABC", throw exception information, if you enter from the keyboard other strings, do not throw an exception.

Import Java.util.Scanner;

Class MyException extends exception{

Private String errormsg;

Getter and Setter methods

Public myexception (String errormsg) {

this.errormsg=errormsg;

}

@Override

Public String toString () {

return errormsg;

}

}

public class Ex11 {

public static void Main (string[] args) {

String Strin;

Scanner scan=new Scanner (system.in);

Strin=scan.nextline ();

try {

if (Strin.equals ("abc"))

throw new MyException ("The string entered is incorrect! “);

} catch (MyException e) {

System.out.println (e);

}

}

}

2) Design a Java program, enter two numbers from the keyboard, perform subtraction operations. When the input string contains non-digits, the program works by using the exception handling mechanism.

Import java.util.*;

public class Ex12 {

public static void Main (string[] args) {

int num1,num2;

Scanner in=new Scanner (system.in);

try {

Num1=in.nextint ();

} catch (Inputmismatchexception e) {

System.out.println ("The first number is not formatted");

num1=0;

}

try {

Num2=in.nextint ();

} catch (Inputmismatchexception e) {

System.out.println ("The second number is not formatted");

num2=0;

}

System.out.println ("num1-num2=" + (num1-num2));

}

}

3) The custom exception class, when the subtraction operation, when the first number is greater than the second number, throw "minuend can not be less than the", and write a program to test.

Import Java.util.Scanner;

Definition of MyException class (with 11th question)

public class Ex13 {

public static void Main (string[] args) {

int num1,num2;

Scanner scan=new Scanner (system.in);

Num1=scan.nextint ();

Num2=scan.nextint ();

try {

if (num1<num2)

throw new MyException ("Minuend cannot be less than meiosis");

} catch (MyException e) {

System.out.println (e);

}

}

}

Java face question (05)