1.建立exception包,编写TestException.java程序，主方法中有以下代码，确定其中可能出现的异常，进行捕获处理。
package Yichang;
public class Text {
public static void main(String[] args) {
for(int i=0;i<4;i++){
int k;
switch(i){
case 0:
try{
int zero=0;
k=911/zero;
}
catch(ArithmeticException e){
System.out.println("输入有误");
}
break;
case 1:
try{
int b[]=null;
k = b[0];
}catch(NullPointerException e)
{
System.out.println("空指针异常");
}
break;
case 2:
try{
int c[]=new int[2];
k=c[9];
}catch(ArrayIndexOutOfBoundsException e)
{
System.out.println("索引超出异常");
}
break;
case 3:
try{
char ch="abc".charAt(99);
}catch(Exception e)
{
e.printStackTrace();
System.out.println("收取字符超出");
}
break;
}
}
}
}
结果：
2.建立exception包，建立Bank类，类中有变量double balance表示存款,Bank类的构造方法能增加存款，Bank类中有取款的发方法withDrawal(double dAmount),当取款的数额大于存款时,抛出InsufficientFundsException,取款数额为负数，抛出NagativeFundsException,如new Bank(100),表示存入银行100元，当用方法withdrawal(150)，withdrawal(-15)时会抛出自定义异常。
package Yichang;
public class InsufficientFundsException extends Exception {
public String getMessage()
{
return "余额不足";
}
}
package Yichang;
public class NagativeFundsException extends Exception {
public String getMessage()
{
return "取款不能为负数";
}
}
package Yichang;
public class Test01 {
private double balance;
public Test01(double balance) {
super();
this.balance = balance;
}
public void withDrawal(double dAmount)throws InsufficientFundsException,NagativeFundsException
{
if(dAmount>balance)
{
throw new InsufficientFundsException();
}
if(dAmount<0)
{
throw new NagativeFundsException();
}
}
public static void main(String[] args){
Test01 t=new Test01(100);
try{
t.withDrawal(150);
}catch(Exception e){
e.printStackTrace();
}
try{
t.withDrawal(-10);
}catch(Exception e){
e.printStackTrace();
}
}
}
结果：
时间： 2024-10-07 22:32:53