【自动化__持续集成】___java___异常处理

一、代码如下

package www.wujianbotwo;

public class Demo12 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		try {
			
		}catch(Exception e) {
			
		}
		

	}
	
	
	

}

package www.wujianbotwo;

public class Demo13 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Demo13 demo13= new Demo13();
		//demo13.nullTest();
		demo13.nullTestFour();

	}

	private void nullTest() {
		// TODO Auto-generated method stub
		try {
			String s= null;
			System.out.println("长度为：" + s.length());
		}
		catch(Exception e) {
			System.out.println("您的字符串没有定义吧！！");
		}
	}
	
	private void nullTestTwo() {
		// TODO Auto-generated method stub
		//try {
			String s= null;
			System.out.println("长度为：" + s.length());
		//}
		//catch(Exception e) {
		//	System.out.println("您的字符串没有定义吧！！");
		//}
	}
	
	
	private void nullTestThree() {
		// TODO Auto-generated method stub
		try {
			String s= null;
			System.out.println("长度为：" + s.length());
		}
		catch(Exception e) {
			System.out.println(e);
		}
	}
	
	private void nullTestFour() {
		// TODO Auto-generated method stub
		try {
			String s= null;
			System.out.println("长度为：" + s.length());
		}
		catch(NullPointerException e) {
			System.out.println(e);
			System.out.println(e.getMessage());
			System.out.println(e.getStackTrace());
		}
	}
}

package www.wujianbotwo;

public class Demo14 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Demo14 demo14= new Demo14();
		demo14.nullTest();

	}
	
	private void nullTest() {
		// TODO Auto-generated method stub
		try {
			String s= null;
			//int x= 9 / 0;
			System.out.println(s.length());
			//System.out.println(x);
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

}

package www.wujianbotwo;

public class Demo14 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Demo14 demo14= new Demo14();
		demo14.nullTest();

	}
	
	private void nullTest() {
		// TODO Auto-generated method stub
		try {
			String s= null;
			//int x= 9 / 0;
			System.out.println(s.length());
			//System.out.println(x);
		} 
		catch (ArithmeticException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		catch (NullPointerException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

}

package www.wujianbotwo;

public class Demo14 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Demo14 demo14= new Demo14();
		demo14.nullTest();

	}
	
	private void nullTest() {
		// TODO Auto-generated method stub
		try {
			String s= null;
			//int x= 9 / 0;
			System.out.println(s.length());
			//System.out.println(x);
		} 
		catch (ArithmeticException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		catch (NullPointerException e) {
			// TODO Auto-generated catch block
			//e.printStackTrace();
			System.out.println(e);
			System.out.println("字符变量没有初始化");
		}
	}

}