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File Stream Reader Writer的扩展方法

使用use扩展关闭资源

小文件，一次性读写操作

java code

package com.yzdzy.kotlin.chapter8.io;import java.io.*;public class IO {    public static void main(String[] args) {        BufferedReader bufferedReader = null;        try {            bufferedReader=new BufferedReader(new FileReader(new File("build.gradle")));            String line;            while ((line=bufferedReader.readLine())!=null){                System.out.println(line);            }        } catch (FileNotFoundException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        }        finally {            try {                bufferedReader.close();            } catch (IOException e) {                e.printStackTrace();            }        }    }}

kt

package com.yzdzy.kotlin.chapter8.ioimport java.io.BufferedReaderimport java.io.Fileimport java.io.FileReaderfun main(args: Array
   
    ) {    val file = File("Build.gradle")    val bufferedReader = BufferedReader(FileReader(file))    var line: String    while (true) {        line = bufferedReader.readLine() ?: break        println(line)    }    bufferedReader.close()    ktIoForUse()    ktIoForReadLines()}fun ktIoForUse(){    val file = File("Build.gradle")    BufferedReader(FileReader(file)).use{        var line:String        while (true){            line=it.readLine()?:break            println(line)        }    }}fun ktIoForReadLines(){    val file = File("Build.gradle")    file.readLines().forEach(::println)}