动手动脑
动手动脑1
程序运行结果：
ArrayIndexOutOfBoundsException/内层try-catch发生ArithmticException
动手动脑2
运行结果：
ArrayIndexOutOfBoundsException/外层try-catch
finally语句块一定会执行吗？
public class EmbededFinally
{ public static void main(String args[]) {
int result;
try {System.out.println("in Level 1")
try
{ System.out.println("in Level 2）;
try {
System.out.println("in Level 3");
result=100/0; //Level 3
}
catch (Exception e) {
System.out.println("Level 3:" + e.getClass().toString());
}
finally {
System.out.println("In Level 3 finally");
}
// result=100/0; //Level 2
}
catch (Exception e) {
System.out.println("Level 2:" + e.getClass().toString());
}
finally {
System.out.println("In Level 2 finally");
}
// result = 100 / 0; //level 1
}
catch (Exception e) {
System.out.println("Level 1:" + e.getClass().toString());
}
finally {
. System.out.println("In Level 1 finally");
}
}
}
结果：
in Level 1
in Level 2
in Level 3
Level 3:class java.lang.ArithmeticException
In Level 3 finally
In Level 2 finally
In Level 1 finally
import javax.swing.*;
public class ChengJi0 {
public static void main(String[] args)
{
int a=0;
try{
String ing = JOptionPane.showInputDialog("输入你的成绩");
a = Integer.parseInt(ing);
}
catch(Exception e)
{
JOptionPane.showMessageDialog(null,"输入不正确，请重新输入","学生成绩",javax.swing.JOptionPane.INFORMATION_MESSAGE);
System.exit(0);
}
if(a>=0&&a<60)
{
JOptionPane.showMessageDialog(null,"不及格","学生成绩",javax.swing.JOptionPane.INFORMATION_MESSAGE);
}
if(a>=60&&a<70)
{
JOptionPane.showMessageDialog(null,"及格","学生成绩",javax.swing.JOptionPane.INFORMATION_MESSAGE);
}
if(a>=70&&a<80)
{
JOptionPane.showMessageDialog(null,"中","学生成绩",javax.swing.JOptionPane.INFORMATION_MESSAGE);
}
if(a>=80&&a<90)
{
JOptionPane.showMessageDialog(null,"良","学生成绩",javax.swing.JOptionPane.INFORMATION_MESSAGE);
}
if(a>=90&&a<=100)
{
JOptionPane.showMessageDialog(null,"优","学生成绩",javax.swing.JOptionPane.INFORMATION_MESSAGE);
}
if(a>100||a<0)
{
JOptionPane.showMessageDialog(null,"输入不正确","学生成绩",javax.swing.JOptionPane.INFORMATION_MESSAGE);
}
}
}
