import java.until.scanner
时间: 2023-04-23 17:00:42 浏览: 149
import java.until.scanner是Java中的一个语句,用于导入Scanner类。Scanner类是Java中的一个工具类,用于读取用户输入的数据。通过导入Scanner类,我们可以在Java程序中使用Scanner类提供的方法来读取用户输入的数据。
相关问题
package test11; import java.time.*; import java.util.Scanner; import java.time.temporal.ChronoUnit; public class CompareDate { public static void main(String args[ ]) { Scanner scanner = new Scanner(System.in); System.out.println("输入开始的年,月,日 "); System.out.println("年月日之间用-,/或.分隔\n例如:2018-2-12"); String regex = "[-./]"; String [] input = scanner.nextLine().split(regex); int year = Integer.parseInt(input[0]); int month = Integer.parseInt(input[1]); int day = Integer.parseInt(input[2]); LocalDate dateStart = null; 【代码1】// LocalDate调用of方法,返回年月日分别是year,,month,day的dateSart对象 System.out.print("输入结束的年,月,日:"); input = scanner.nextLine().split(regex); year = Integer.parseInt(input[0]); month = Integer.parseInt(input[1]); day = Integer.parseInt(input[2]); LocalDate dateEnd = null; 【代码2】// LocalDate调用of方法返回年月日分别是year,,month,day的dateEnd对象 long days = 【代码3】//得到dateStart和dateEnd相隔的天数 boolean boo = 【代码4】//判断dateEnd是否在dateStart之后 if(boo) System.out.println(dateEnd+"在"+dateStart+"之后"); System.out.println(dateStart+"和"+dateEnd+"相隔:"); System.out.println(Math.abs(days)+"天(不足一天的零头按0计算)"); } }
这段代码中,需要填写四处缺失的代码,分别是:
【代码1】:使用LocalDate类的of()方法,返回一个年月日分别为指定参数的LocalDate对象。
【代码2】:使用LocalDate类的of()方法,返回一个年月日分别为指定参数的LocalDate对象。
【代码3】:使用LocalDate类的until()方法,计算两个LocalDate对象之间相隔的天数。
【代码4】:使用LocalDate类的isAfter()方法,判断一个LocalDate对象是否在另一个LocalDate对象之后。
完整代码如下:
```
package test11;
import java.time.*;
import java.util.Scanner;
import java.time.temporal.ChronoUnit;
public class CompareDate {
public static void main(String args[ ]) {
Scanner scanner = new Scanner(System.in);
System.out.println("输入开始的年,月,日 ");
System.out.println("年月日之间用-,/或.分隔\n例如:2018-2-12");
String regex = "[-./]";
String [] input = scanner.nextLine().split(regex);
int year = Integer.parseInt(input[0]);
int month = Integer.parseInt(input[1]);
int day = Integer.parseInt(input[2]);
LocalDate dateStart = LocalDate.of(year, month, day);【代码1】
System.out.print("输入结束的年,月,日:");
input = scanner.nextLine().split(regex);
year = Integer.parseInt(input[0]);
month = Integer.parseInt(input[1]);
day = Integer.parseInt(input[2]);
LocalDate dateEnd = LocalDate.of(year, month, day);【代码2】
long days = ChronoUnit.DAYS.between(dateStart, dateEnd);【代码3】
boolean boo = dateEnd.isAfter(dateStart);【代码4】
if(boo)
System.out.println(dateEnd+"在"+dateStart+"之后");
System.out.println(dateStart+"和"+dateEnd+"相隔:");
System.out.println(Math.abs(days)+"天(不足一天的零头按0计算)");
}
}
```
Use java to create a new class that reads the conversation.txt line by line and prints it to the console. In this class you should implement two different methods to read the file:1. Implement a method using a Scanner that reads the file2. Implement a method that uses a BufferedReader to read the file.Finally, alter the second method that reads the file line by line using a BufferedReader. After printing the first two lines, make your programme wait for the user to press enter before printing the next two lines. Continue this until all the lines are printed. Once the end of the file is reached, the programme should terminate so that when the user presses enter again, nothing bad happens.
Sure, here's the code to implement the above requirements:
```java
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.util.Scanner;
public class ReadConversation {
public static void main(String[] args) throws IOException {
// Method 1: Using Scanner to read file
File file = new File("conversation.txt");
Scanner scanner = new Scanner(file);
while (scanner.hasNextLine()) {
System.out.println(scanner.nextLine());
}
scanner.close();
System.out.println("\n---------------------------------\n");
// Method 2: Using BufferedReader to read file
FileReader fileReader = new FileReader(file);
BufferedReader bufferedReader = new BufferedReader(fileReader);
String line;
int count = 0;
int linesToPrint = 2;
while ((line = bufferedReader.readLine()) != null) {
System.out.println(line);
count++;
if (count == linesToPrint) {
System.out.print("Press Enter to continue...");
Scanner inputScanner = new Scanner(System.in);
inputScanner.nextLine();
count = 0;
}
}
bufferedReader.close();
}
}
```
This code reads the file "conversation.txt" using two different methods - `Scanner` and `BufferedReader`. The first method simply reads the file and prints it line by line. The second method reads the file line by line using `BufferedReader` and waits for the user to press enter after printing every two lines.
Hope this helps!