下面這段程序看不懂 誰(shuí)能大概解釋下的
import java.io.*;
class J_Exception extends Exception {
} public class J_Test {
public static void main(String[] args)
{ try { int i = System.in.read(); if(i == '0')
throw new J_Exception(); //手動(dòng)拋出異常
System.out.print("1");
}catch(IOException ex) {
System.out.print("2");
}catch(J_Exception ex) {
System.out.print("3");
}finally
{ System.out.println("4");
}
}
}
為什么當(dāng)輸入0時(shí)得到34