Java(Exception)_08

2024-11-04

 

str1 문자열 길이 >>> 4
java.lang.NullPointerException: Cannot invoke "String.length()" because "str2" is null
	at basic.Exception_08.exception1(Exception_08.java:15)
	at basic.Exception_08.main(Exception_08.java:47)
java.lang.ArithmeticException: / by zero
	at basic.Exception_08.exception2(Exception_08.java:35)
	at basic.Exception_08.main(Exception_08.java:49)

 

package basic;

public class Exception_08 {

	void exception1 () {
		
		String str1 = "java";
		
		String str2 = null;
		
		try {
			
			System.out.println("str1 문자열 길이 >>> " + str1.length());
			
			System.out.println("str2 문자열 길이 >>> " + str2.length());
			
		}catch(Exception e) {
			
			e.printStackTrace();
			
			/*
			 *  printStackTrace()
			 *  - 에러 메세지의 발생 근원을 찾아서
			 *    단계별로 에러 메세지를 출력해 주는 메서드. 
			 */
		}
	}
	
	void exception2() {
		
		int num1 = 14, num2 = 0, result = 0;
		
		try {
			
			result = num1 / num2;
			
		}catch(Exception e) {
			
			e.printStackTrace();
		}
	}
	
	public static void main(String[] args) {
		
		Exception_08 exception = new Exception_08();
		
		exception.exception1();
		
		exception.exception2();
	}
}