java 自动关闭资源的try语句
2020-12-13 05:17
标签:代码 demo line done toc lin resources read NPU Java 7简化资源清理(try-with-resources)自动关闭资源的try语句 自动关闭资源格式: try( )//此处多了圆括号,()圆括号内写打开资源的代码,在这里创建的对象必须实现Autocloseable接口 { IO操作 } catch(){ 处理异常的代码 } Eg:package july7file; //java7开始的自动关闭资源 import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; public class Demo8 { public static void main(String[] args) throws IOException { File src = new File("E:/自荐信.doc"); File tar = new File("E:/自荐信1.doc"); copy(src, tar); System.out.println("Well done !"); } public static void copy(File src, File tar) throws IOException { try (InputStream is = new FileInputStream(src); OutputStream os = new FileOutputStream(tar);) //圆括号内写打开资源的操作 { byte[] b = new byte[1024]; int len; while ((len = is.read(b)) != -1) { os.write(b); } } catch (IOException e) { e.printStackTrace(); } } } java 自动关闭资源的try语句 标签:代码 demo line done toc lin resources read NPU 原文地址:https://www.cnblogs.com/fanweisheng/p/11136228.html
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