Java 如何打印每行的第一个单词?
我有一个文本文件,如下所示:Java 如何打印每行的第一个单词?,java,string,arraylist,bufferedreader,Java,String,Arraylist,Bufferedreader,我有一个文本文件,如下所示: 1. Bananas that are not green 2. Pudding that is not vanilla 3. Soda that is not Pepsi 4. Bread that is not stale 我只想把每行的第一个字打印出来 不包括数字 它应打印为: Bananas Pudding Soda Bread 这是我的密码: public static void main(String[] args) { Bu
1. Bananas that are not green
2. Pudding that is not vanilla
3. Soda that is not Pepsi
4. Bread that is not stale
我只想把每行的第一个字打印出来
不包括数字
它应打印为:
Bananas
Pudding
Soda
Bread
这是我的密码:
public static void main(String[] args) {
BufferedReader reader = null;
ArrayList <String> myFileLines = new ArrayList <String>();
try {
String sCurrentLine;
reader = new BufferedReader(new
FileReader("/Users/FakeUsername/Desktop/GroceryList.txt"));
while ((sCurrentLine = reader.readLine()) != null) {
System.out.println(sCurrentLine);
}
} catch (IOException e) {
e.printStackTrace();
System.out.print(e.getMessage());
} finally {
try {
if (reader != null)reader.close();
} catch (IOException ex) {
System.out.println(ex.getMessage());
ex.printStackTrace();
}
}
}
publicstaticvoidmain(字符串[]args){
BufferedReader reader=null;
ArrayList myFileLines=新的ArrayList();
试一试{
弦电流线;
读卡器=新的BufferedReader(新的
FileReader(“/Users/FakeUsername/Desktop/GroceryList.txt”);
而((sCurrentLine=reader.readLine())!=null){
System.out.println(sCurrentLine);
}
}捕获(IOE异常){
e、 printStackTrace();
System.out.print(如getMessage());
}最后{
试一试{
if(reader!=null)reader.close();
}捕获(IOEX异常){
System.out.println(例如getMessage());
例如printStackTrace();
}
}
}
请尝试下面的代码-:
outerWhileLoop:
while ((sCurrentLine = reader.readLine()) != null) {
//System.out.println(sCurrentLine);
StringTokenizer st = new StringTokenizer(sCurrentLine," .");
int cnt = 0;
while (st.hasMoreTokens()){
String temp = st.nextToken();
cnt++;
if (cnt == 2){
System.out.println(temp);
continue outerWhileLoop;
}
}
}
使用String的
split
函数。它根据要与字符串拆分的字符返回字符串数组。在您的情况下,如下所示
String sCurrentLine = new String();
reader = new BufferedReader(new
FileReader("/Users/FakeUsername/Desktop/GroceryList.txt"));
while ((sCurrentLine = reader.readLine() != null) {
String words[] = sCurrentLine.split(" ");
System.out.println(words[0]+" "+words[1]);
}
Java 8+您可以使用
BufferedReader
的方法非常轻松地执行此操作:
String filename = "Your filename";
reader = new BufferedReader(new FileReader(fileName));
reader.lines()
.map(line -> line.split("\\s+")[1])
.forEach(System.out::println);
输出:
这将创建一个
流
,其中包含BufferedReader
中的所有行,将每行分割为空白,然后获取第二个标记并打印它查找实际上您只想打印单词[1],因为不应打印数字。
Bananas
Pudding
Soda
Bread