电大Java语言实验报告三.doc

《Java 语言与面向对象程序设计基础》课程

实验报告三

姓名：xxx
学号：xxxxxxxxxxxxxx
实验题 1

[实验要求]
为本实验中程序添加异常处理机制
记录修改后程序和运行结果[实验程序]
程序 1-1 class A{}
class B extends A{}
public class ClassCastExceptionTest{
public static void main(String args[]){
A a=new A();
B b=(B)a;

public class ClassCastExceptionTest{
public static void main(String args[]){
A a=new A();
try{
B b=(B)a;
}catch(ClassCastException e){
System.out.println("catch ClassCastException!!!");
}
}
}
程序 1-2
public class ArrayIndexOutOfBoundsExceptionTest{
public static void main(String arg[]){
int a[]=new int [10];
for (int i=0 ;i<=10;i++){a[i]=0;}

public class ArrayIndexOutOfBoundsExceptionTest{
public static void main(String arg[]){
int a[]=new int [10];
for (int i=0 ;i<=10;i++){
try{
a[i]=0;
}catch(ArrayIndexOutOfBoundsException e){
System.out.println("catch ArrayIndexOutOfBoundsException!!!");

}
}
}
}
程序 1-3
public class ArithmeticExceptionTest{
public static void main(String arg[]){
int s=100;
for (int i=-3;i<5;i++){s=s/i;}

public class ArithmeticExceptionTest{
public static void main(String arg[]){
int s=100;
for (int i=-3;i<5;i++){
try{
s=s/i;
}catch(ArithmeticException e){
System.out.println(e);
}
System.out.println(s);
}
}
}

程序 1-4
public class StringException{
public static void main(String args[]){
String s1=new String("aaaa bbbb cccc");
System.out.println(s1);
String s2;
s2=s1.substring(30);
System.out.println(s2);
}
}

public class StringException{
public static void main(String args[]){
String s1=new String("aaaa bbbb cccc");
System.out.println(s1);
String s2;
try{
s2=s1.substring(30);
System.out.println(s2);
}catch(StringIndexOutOfBoundsException e){

System.out.println(e);
}
System.out.println("It's OK!");
}
}
[运行结果]
程序 1-1

程序 1-2