Java-java7的异常新特性

Java7的异常新特性:

Android用不到Java7,支持的Java5/java6语法.

----------------------------------------------------------------------------------------

1):增强的throw

2):多异常捕获

3):自动资源关闭

public class MultiCatchDemo {
	public static void main(String[] args) {
		String num1 = "50";
		String num2 = "2b";
		try {
			int ret1 = Integer.parseInt(num1); // String类型转换为int类型
			int ret2 = Integer.parseInt(num2);// String类型转换为int类型
			System.out.println("===============");
			int ret = ret1 / ret2;
			System.out.println("结果为" + ret);

		} catch (ArithmeticException | NumberFormatException e) {  //处理算数异常
			System.out.println("异常类型1");
			e.printStackTrace();
		
		}catch (Exception e) { //都不满足上述异常类型的时候执行这里 ,在所有catch之后
			System.out.println("异常类型3");
			e.printStackTrace();
		}
	}
}

public class AutoCloseDemo {
	public static void main(String[] args) {
		test1();
		test2();
	}

	private static void test1() {
		OutputStream out = null;
		try {
			// 打开一个资源对象
			out = new FileOutputStream("C:/123.txt");
			// 操作资源对象
			out.write(1);
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			// 关闭资源
			try {
				if (out != null) {
					out.close();
				}
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
	}

	private static void test2() {
		try (

		// 打开资源对象
		OutputStream out = new FileOutputStream("C:/123.txt");) {
			out.write(1);
		} catch (Exception e) {
			// 处理异常
			e.printStackTrace();
		}
	}
}