從另一個類調用一個類的方法

Question

這是我當前的代碼：
如何將方法調用到其他類？

import java.util.Random;

public class WordSelect {
    private Random r;

    public void selectHundred(String[]w5000, String[] w100) {
        r = new Random();     
        int i = 0;

        while (i < w100.length) {
            int random = r.nextInt(w5000.length);
            w100[i] = w5000[random];
            i++;
        }
    }
}

Answer 1

是否要創建WordSelect的對象並從其他類調用selectHundred方法？ 如果是這樣，您可以執行以下操作

//This should be in the MainClass.java file
package test;

public class MainClass {
    public static void main(String[] args) {
        WordSelect ws = new WordSelect();


        String[] w5000 = new String[10];//replace this and the following 10 lines with your w5000

        w5000[0] = "a";
        w5000[1] = "b";
        w5000[2] = "c";
        w5000[3] = "d";
        w5000[4] = "e";
        w5000[5] = "f";
        w5000[6] = "g";
        w5000[7] = "h";
        w5000[8] = "i";
        w5000[9] = "j";



        String[] w100 = ws.selectHundred(w5000); // I believe you already have w5000, and you will the 100 random words in the w100
        for(int i=0;i<w100.length;i++) {
            System.out.println(w100[i]);
        }

    } 
}

但是您需要將現有程序更改為以下內容，以便該方法可以返回100個字符串的數組

//This should be in the WordSelect.java file
package test;

import java.util.Random;

public class WordSelect {
    private Random r;

    public String[] selectHundred(String[]w5000) {
        r = new Random();     
        int i = 0;
        String []w100 = new String [5];

        while (i < w100.length) {
            int random = r.nextInt(w5000.length);
            w100[i] = w5000[random];
            i++;
        }

        return w100;
    }
}