简单理解读写文件

Scanner inFile=new Scanner(new File("ForTest.java"));
    File outFile =new File("ForTest_copy.java");
	BufferedWriter output=new BufferedWriter(new FileWriter(outFile));
	String temp1=null;
    
    while(inFile.hasNext()){
    	temp1+=inFile.nextLine()+"\n";
	}
    System.out.println(temp1);
    output.write(temp1);
    output.close();