将文件读入数组 – Java

发布时间：2020-12-15 04:27:27 所属栏目：Java 来源：网络整理

导读：我正在练习 java,并在线观看练习：但是,我陷入了我需要的地步 Read the file again,and initialise the elements of the array 任务 Write class Members representing a list of members as an array Constructor should take String argument (file name)

我正在练习 java,并在线观看练习：

但是,我陷入了我需要的地步

Read the file again,and initialise the elements of the array

任务

Write class Members representing a list of members as an array

Constructor should take String argument (file name)

Use scanner to read lines and create array big enough to hold the file

Read the file again and initialise elements of the array

现行守则

import java.io.*;
import java.util.*;

class Members {

    MemberElement[] members;

    public Members(String fileName) throws IOException {
        File myFile = new File(fileName);
        Scanner scan = new Scanner(myFile);

        int numOfLines = 0;
        while(scan.hasNextLine()) {
            scan.nextLine();
            numOfLines++;
        }
        scan.close();
        scan = new Scanner(myFile);

        members = new MemberElement[numOfLines];   
}

MemberElement类：

class MemberElement {

    private String name;
    private int number;
    private int birthDate;

    public MemberElement(String name,int number,int birthDate) {
        this.name = name;
        this.number = number;
        this.birthDate = birthDate;
    }

    public String getName() {
        return this.name;
    }

    public int getNumber() {
        return this.number;
    }

    public int getBirth() {
        return this.birthDate;
    }

    public String toString() {
        return getName() + " " + getNumber() + " " + getBirth(); 
    }
}

文本文件的内容：

Wendy Miller 7654 17-2-1960
Dolly Sheep 4129 15-5-1954
Dolly Sheep 5132 21-12-1981
Irma Retired Programmer 345 15-11-1946

解决方法

它与计算线基本相同：

int numOfLines = 0;
while(scan.hasNextLine()) {
    scan.nextLine();
    numOfLines++;
}

但是,我们现在需要实际访问下一行.快速浏览Scanner docs告诉我,nextLine正好返回我们想要的东西.

int numOfLine = 0;
while(scan.hasNextLine()) {
    String line = scan.nextLine();
    members[numOfLine] = new MemberElement(line,numOfLine,/* birthDate */);
    numOfLine++;
}

（编辑：李大同）

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