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public static void test1(){ FileInputStream ins = null; FileOutputStream out = null; try { ins = new FileInputStream(new File("G://aa.text")); out = new FileOutputStream(new File("G://bb.text")); //业务逻辑 }catch (FileNotFoundException ex){ ex.printStackTrace(); }finally { //关闭资源 if(ins != null){ try { ins.close(); }catch (Exception insex){ insex.printStackTrace(); } } if(out != null){ try { out.close(); }catch (Exception outex){ outex.printStackTrace(); } } } }
public static void test2(){ try(FileInputStream ins = new FileInputStream(new File("G:/aa.text")); FileOutputStream out = new FileOutputStream(new File("G://bb.text"))){ //业务逻辑 }catch (FileNotFoundException fnex){ fnex.printStackTrace(); }catch (IOException ioex){ ioex.printStackTrace(); } }
附:
资源一般是指:实现了Closeable接口或者AutoCloseable接口,这种资源使用完毕后都需要关闭。package java.io;import java.io.IOException;/** * A {@code Closeable} is a source or destination of data that can be closed. * The close method is invoked to release resources that the object is * holding (such as open files). * * @since 1.5 */public interface Closeable extends AutoCloseable { /** * Closes this stream and releases any system resources associated * with it. If the stream is already closed then invoking this * method has no effect. * *As noted in {@link AutoCloseable#close()}, cases where the * close may fail require careful attention. It is strongly advised * to relinquish the underlying resources and to internally * mark the {@code Closeable} as closed, prior to throwing * the {@code IOException}. * * @throws IOException if an I/O error occurs */ public void close() throws IOException;}
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