//java的课上代码 package lww.class16;
import java.io.File; import java.io.FileReader; import java.io.FileWriter; import java.io.IOException;
public class FileTest {
public static void main(String[] args) {
File file = new File("D://lww");
if(!file.exists()){
file.mkdir();
System.out.println("文件夹创建成功");
}else{
String[] files = file.list();
for(int i = 0; i < files.length; i++){
System.out.println(files[i]);
}
}
File fileDrectory = new File("D://lww//test.txt");
if(!fileDrectory.exists()){
try {
fileDrectory.createNewFile();
FileWriter writer = new FileWriter(fileDrectory);
writer.write("Hello,lww");
writer.close();
System.out.println("写入文件成功");
FileReader reader = new FileReader(fileDrectory);
char[] chs = new char[20];
System.out.println(reader.read(chs));
reader.close();
} catch (IOException e) {
System.out.println("文件创建失败，无法写入信息");
e.printStackTrace();
}
} else {
}
}
} :+1: