空指標異常： NullPointerException

陣列下標越界異常：ArrayIndexOutOfBoundsException

字串下標越界異常：StringIndexOutOfBoundsException

不合法的引數異常：IllegalArgumentException

算術異常：ArithmeticException

數字格式化異常：NumberFormatException

類造型異常：ClassCastException

複製中自定義異常的處理：

程式碼如下：

自定義一個異常類,其繼承了Excetion類

public class CopyException extends Exception{

	public CopyException() {
		super();
	}

	public CopyException(String message, Throwable cause) {
		super(message, cause);
	}

	public CopyException(String message) {
		super(message);
	}

	public CopyException(Throwable cause) {
		super(cause);
	}
	
}
 

public class TestDemo5 {
	public static void main(String[] args) throws CopyException {
		FileInputStream fis = null;
		FileOutputStream fos = null;
		System.out.println("開始");
		try {
			fis = new FileInputStream("pw.txt");
			fos = new FileOutputStream("copy.txt");
			int d = -1;
			while( (d = fis.read())!=-1 ){
			fos.write(d);
			}
			System.out.println("複製完畢");
		} catch (FileNotFoundException e) {
			//丟擲自定義異常
			throw new CopyException("檔案沒有找到",e);
		} catch (IOException e) {
			//丟擲自定義異常
			throw new CopyException("讀寫異常",e);
		} finally {
			if(fis != null){
				try {
					fis.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
			if(fos != null){
				try {
					fos.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
		}
	}
}