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请写出E类中标注的【代码3】的输出结果____。import java.io.*;public class E { public static void main(String args[]) { int n=-1; File f =new File("hello.txt"); byte [] a="abcd".getBytes(); try{ FileOutputStream out=new FileOutputStream(f); out.write(a); out.close(); FileInputStream in=new FileInputStream(f); byte [] tom= new byte[3]; int m = in.read(tom,0,3); System.out.println(m); //【代码1】 String s=new String(tom,0,3); System.out.println(s); //【代码2】 m = in.read(tom,0,3); System.out.println(m); //【代码3】 s=new String(tom,0,3); System.out.println(s); //【代码4】 } catch(IOException e) {} }}

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请写出E类中标注的【代码4】的输出结果____。import java.io.*;public class E { public static void main(String args[]) { int n=-1; File f =new File("hello.txt"); byte [] a="abcd".getBytes(); try{ FileOutputStream out=new FileOutputStream(f); out.write(a); out.close(); FileInputStream in=new FileInputStream(f); byte [] tom= new byte[3]; int m = in.read(tom,0,3); System.out.println(m); //【代码1】 String s=new String(tom,0,3); System.out.println(s); //【代码2】 m = in.read(tom,0,3); System.out.println(m); //【代码3】 s=new String(tom,0,3); System.out.println(s); //【代码4】 } catch(IOException e) {} }}

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