Java---12种常用异常产生与分析--（附异常体系图）

Java---12种常用异常产生与分析

常见运行异常(7种)：

ArithmeticException，ArrayStoreEcxeption，ClassCastException，IllegalArgumentException

IndexOutOfBoundsException，NoSuchElementException，NullPointerException

常见编译异常(5种)：

ClassNotFoundException，FileNotFoundException，IOException，ParseException，UnsupportedEncodingException

import java.awt.Color;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.Iterator;
import java.util.List;

public class Test5 {

//Java12种常用异常产生与分析--（附异常体系图）
public static void main(String[] args)  {
//运行异常（在程序运行时才会产生的异常）
//①.ArithmeticException ---数学运算异常
//Exception in thread "main" java.lang.ArithmeticException: / by zero
int a=6;
int b=a/0;

//②.ArrayStoreEcxeption  ---数组存储异常
//Exception in thread "main" java.lang.ArrayStoreException: java.lang.Integer
 Object x[] = new String[3];
 Integer aa=new Integer(5);
 //此处有自动装箱过程
 x[0] = 11;

//③.ClassCastException ---类转化异常
//Exception in thread "main" java.lang.ClassCastException: a20180811.Fa cannot be cast to a20180811.Son
 Son son=(Son)new Fa();

//④.new IllegalArgumentException(); ---参数异常
// java.lang.IllegalArgumentException: Color parameter outside of expected range: Green
 Color c = new Color(0,258,0);


//⑤.IndexOutOfBoundsException ---下表越界异常
//Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 3
String[] str=new String[3];
str[0]="xiaoming";str[1]="ff";
str[2]="ee";str[3]="ff";

//⑥.NoSuchElementException  ---元素不存在异常
//Exception in thread "main" java.util.NoSuchElementException
List<Integer> list=new ArrayList<Integer>();
list.add(111);
list.add(222);
Iterator<Integer> it = list.iterator();
while(it.hasNext()){
it.next();
it.next();
it.next();
}

//⑦.NullPointerException ---空指针异常
//Exception in thread "main" java.lang.NullPointerException
String strr=null;
System.out.println(strr.toCharArray());


//编译时异常 
// ①.ClassNotFoundException ---类未找到异常
try {
Class.forName("com.args");
} catch (ClassNotFoundException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}

//②.FileNotFoundException   ---文件未找到异常
File file=new File("d:/args");

FileInputStream fis=null;
FileOutputStream fos=null;
try {
fis = new FileInputStream(file);
fos = new FileOutputStream("d:/dd");
} catch (FileNotFoundException e2) {
// TODO Auto-generated catch block
e2.printStackTrace();
}
int n;

//③.IOException    ---文件流异常
try {
while((n=fis.read())!=-1){
fos.write(n);
}
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}finally{
try {
fos.close();
fis.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

}

//④.ParseException   ---格式转化异常
SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");
try {
Date parse = sdf.parse("2018-09-03");
String format = sdf.format(parse);
System.out.println(format);
} catch (ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

//⑤.UnsupportedEncodingException   ---未提供的编码集异常
byte[] by=new byte[]{1,3,5,6};
try {
String string = new String(by,"jbk");
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

}
}
class Fa{}
class Son extends Fa{}

篇幅太多：------图在下篇