[英]How to read a text file and add lines of it into an array in Java?
我是編碼新手,我想知道如何將文本文件的行添加到程序中的數組中。 我的代碼如下所示:
import java.io.*;
public class Test {
static String [] name = new String [3];
static String [] surname = new String [3];
public static void main(String[] args) {
try{
BufferedReader reader =null;
String currentLine = reader.readLine();
reader=new BufferedReader(new FileReader("Names.txt"));
int x=0;
while(currentLine!=null){
name[x]=reader.readLine();
currentLine=reader.readLine();
surname[x]=reader.readLine();
currentLine=reader.readLine();
x=x+1;
}
}
catch(Exception e){
System.out.println("The following error occured:" + e.getMessage());
}
for(int x =0; x<name.length; x++){
System.out.println(
"name:" + name[x] + "\n"+
"surname: " + surname[x] +"\n"
);
}
}
我得到的錯誤是Cannot invoke "java.io.BufferedReader.readLine()" because "reader" is null
。 我該如何解決?
我不確定我的答案。 我認為這是因為您忘記將 java io package 導入程序。 希望你明白了。
public class Task3 {
static String [] name = new String [3];
static String [] surname = new String [3];
public static void main(String[] args) {
try{
BufferedReader reader =null;
reader=new BufferedReader(new FileReader("/home/ancubate/names.txt"));
List<String> lines = reader.lines().collect(Collectors.toList());
int x=0;
while(lines.size() != (x+1)){
name[x]=lines.get(x);
surname[x]=lines.get(x);
x=x+1;
}
}
catch(Exception e){
System.out.println("The following error occured:" + e.getMessage());
}
for(int x =0; x<name.length; x++){
System.out.println(
"name:" + name[x] + "\n"+
"surname: " + surname[x] +"\n"
);
}
}
}
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