Question

我正在尝试用Java读一个句子，并知道那里有多少个单词。这就是我所做的：

public class TestWords {
    public static void main(String[] args) {
        System.out.println("Give your phrase");
        Scanner extr=new Scanner(System.in);

        String Phrase;
        Phrase = extr.nextLine();
        int TotalSizeOfPhrase = Phrase.length();

        double number;
        for (int i=0; i < TotalSizeOfPhrase; i++)
        {
            if (Phrase[i] != number &&  Character.isWhitespace(s.charAt(i)))                    
            {
                TotalWords = TotalWords + 1;   
            }
        }
    }
}

我想知道如何编写代码：

if (Phrase[i]!= 'of an **arbitrary** number && white space')

然后：

TotalWords = TotalWords + 1;

因为当我输入时它标志着一个错误：

Character.isWhitespace(s.charAt(i))

Answer 1

有几个错误

Hello i'm 20 and I'm a beginner
20

输入：

输出：

public static void main(String[] args) {
    System.out.println("Give your phrase");
    Scanner extr = new Scanner(System.in);

    String Phrase;

    Phrase = extr.nextLine();

    String[] words = Phrase.trim().split(" ");

    System.out.println("Totals Number Of Words: " + words.length);

    for (String word : words) {
        System.out.println(word.trim());
    }

}

Answer 2

我这样做的方法是用白色空格分割线条（获取单词），将它们添加到数组中，然后获得这个数组长度等于字数。

Phrase = Phrase.trim(); //make sure there is no spaces at start or end of the line
String[] words = Phrase.split(" "); //get the words 
int word_count = words.length;  //get the word count in line

Answer 3

如果你想获得句子中的单词数，你可以使用这段代码：

int numberOfWords = Phrase.trim().isEmpty() ? 0 : trim.split("\\s+").length;

Answer 4

您可以使用此代码：

import { inject } from 'aurelia-framework';
import { DialogController } from 'aurelia-dialog';
import { ValidationController, ValidationRules } from 'aurelia-validation';
import { MaterializeFormValidationRenderer } from './../resources/elements/materialize-form-validation-renderer';

@inject(DialogController, ValidationController)
export class AddProject {

    rules = ValidationRules
        .ensure('name')
        .required()
        .withMessage('Please enter a name for your project.')
        .rules;

    constructor(dialogController, validationController) {
        this.name = '';
        this.project = null;
        this.dialogController = dialogController;
        this.validationController = validationController;
        this.validationController.addRenderer(new MaterializeFormValidationRenderer());
    }

    activate(project) {
        this.project = project;
    }

    detached() {
        this.validationController.reset();
    }

    validateModel() {
        return new Promise((resolve, reject) => {
            this.validationController.validate().then(v => {
                resolve(v.valid);
            });
        }, function (error) {
            reject(error);
        });
    }

    validateProject(e) {
        this.validateModel().then(valid => {
            if (valid) {
                this.project.name = this.name;
                this.name = '';
                //this.validationController.reset();
                this.dialogController.ok(this.project);
            }
        });
    }

    cancel(e) {
        this.name = '';
        //this.validationController.reset();
        this.dialogController.cancel();
    }
}

关于用Java阅读句子的练习

4 个答案: