java
import org.testng.annotations.Test;
import java.io.File;
import java.io.IOException;
public class FileCreate {
public static void main(String[] args) {
}
@Test public void create1(){
String filePath = “D:\\file1.txt”;
File file = new File(filePath);
try {
file.createNewFile();
System.out.println(“创建文件 1 成功”);
} catch (IOException e) {
e.printStackTrace();
}
}
@Test public void create2(){
File parentFile = new File(“D:\\”);
String fileNane = “file2.txt”;
File file = new File(parentFile, fileNane);
try {
file.createNewFile();
System.out.println(“文件 2 创建成功”);
} catch (IOException e) {
throw new RuntimeException(e);
}
}
@Test public void create3(){
String parentPath = “d:\\”;
String filePath = “file3.txt”;
File file = new File(parentPath, filePath);
try {
file.createNewFile();
System.out.println(“文件 3 创建成功”);
} catch (IOException e) {
throw new RuntimeException(e);
}
}
}
获取文件
import org.testng.annotations.Test;
import java.io.File;
public class FileInformation {
public static void main(String[] args) {
}
@Test
public void Info(){
File file = new File(“D:\\file1.txt”);
System.out.println(“文件名称：”+file.getName());
System.out.println(“文件绝对路径：”+file.getAbsolutePath());
System.out.println(“文件父目录：”+file.getParent());
System.out.println(“文件大小(字节)：”+file.length());
System.out.println(“文件是否存在：”+file.exists());
System.out.println(“是否是文件：”+file.isFile());
System.out.println(“是否是目录：”+file.isDirectory());
}
}
Scanner 与 Println
import org.testng.annotations.Test;
import java.util.Scanner;
public class scanPrintTest {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
String str = input.next();
System.out.println(str);
System.out.println(“hello world”);
}
}
import java.util.Scanner;
public class scanTest {
public static void main(String[] args) {
Scanner input =new Scanner(System.in);
System.out.print(“请输入一个 double 类型的数:”);
double d = input.nextDouble();
System.out.println(d);
System.out.print(“请输入一个 int 类型的数:”);
int i = input.nextInt();
System.out.println(i);
System.out.print(“请输入一个 string 类型的数:”); String s = input.next(); System.out.println(s);
}
}