基本做法

public class CopyFileDemo {public static void main(String[] args) {}//try...catch...finallyprivate static void method2() {FileReader fr = null;FileWriter fw = null;try {fr = new FileReader("fr.txt");fw = new FileWriter("fw.txt");char[] chs = new char[1024];int len;while ((len = fr.read()) != -1) {fw.write(chs, 0, len);}} catch (IOException e) {e.printStackTrace();} finally {if(fw!=null) {try {fw.close();} catch (IOException e) {e.printStackTrace();}}if(fr!=null) {try {fr.close();} catch (IOException e) {e.printStackTrace();}}}}//拋出處理private static void method1() throws IOException {FileReader fr = new FileReader("fr.txt");FileWriter fw = new FileWriter("fw.txt");char[] chs = new char[1024];int len;while ((len = fr.read()) != -1) {fw.write(chs, 0, len);}fw.close();fr.close();} }

JDK7版本改進

public class CopyFileDemo {public static void main(String[] args) {}//JDK7的改進方案private static void method3() {try(FileReader fr = new FileReader("fr.txt");FileWriter fw = new FileWriter("fw.txt");){char[] chs = new char[1024];int len;while ((len = fr.read()) != -1) {fw.write(chs, 0, len);}} catch (IOException e) {e.printStackTrace();}} }

JDK9版本改進

public class CopyFileDemo {public static void main(String[] args) {}//JDK9的改進方案private static void method4() throws IOException {FileReader fr = new FileReader("fr.txt");FileWriter fw = new FileWriter("fw.txt");try(fr;fw){char[] chs = new char[1024];int len;while ((len = fr.read()) != -1) {fw.write(chs, 0, len);}} catch (IOException e) {e.printStackTrace();}} }

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超強干貨來襲 云風(fēng)專訪：近40年碼齡，通宵達旦的技術(shù)人生

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