メインで文字列メソッドを呼び出す

Question

文字列を返す単純なメソッドを呼び出そうとしていますが、何らかの理由で空白になっていて、これを正しく行う方法がわかっていません。私はバンドクラスの）メソッドGETINFO（呼び出しにしようとしていますし、その中に文字列BANDINFOのthatsのをプリントアウトする：

public class App { 


public static void main(String[] args) { 

    Bands[] bands = new Bands[5]; 

    bands[0] = new Bands("Joe", "Rick", "Nick", "Dalton", "Doylestown, PA", "RockOn", 4000.50 , "Rock"); 
    bands[1] = new Bands("Luke", "Bill", "Ian", "Matt", "State College, PA", "Blink182", 3500.50 , "Alternative"); 
    bands[2] = new Bands("Corey", "Noah", "Jon", "Kaleb", "Philadelphia, PA", "Rise Against", 10000.50 , "Rock"); 
    bands[3] = new Bands("Jake", "Joey", "Mike", "Mac", "New York, NY", "Thousand Foot Krutch", 2000.50 , "Rock"); 
    bands[4] = new Bands("Bob", "Jeff", "Dom", "Mark", "King of Prussia, PA", "Skillet", 5500.50 , "Rock"); 

    bands[0].compete(); 
    bands[1].compete(); 
    bands[2].compete(); 
    bands[3].compete(); 
    bands[4].compete(); 

    for (int i = 0; i < 5; i++) { 
     String bandInfo = getInfo(bandInfo); 
    } 
} 
} 

そして、ここでは私のバンドのクラスコードです：

import java.util.Random; 

public class Bands { 

private String singerName; 
private String guitarName; 
private String bassistName; 
private String drummerName; 
private String Hometown; 
private String bandName; 
private double income; 
private String genre; 
private int score; 

public Bands(String singerName, String guitarName, String bassistName, String drummerName, String Hometown, String bandName, double income, String genre) 
{ 
    this.singerName = singerName; 
    this.guitarName = guitarName; 
    this.bassistName = bassistName; 
    this.drummerName = drummerName; 
    this.bandName = bandName; 
    this.Hometown = Hometown; 
    this.income = income; 
    this.genre = genre; 
    this.score = -1; 
} 

public void compete() 
{  
    Random rand = new Random(); 
    this.score = rand.nextInt(20); 

} 

public String getInfo() 
{ 
    String bandInfo = "Band: " + this.bandName + ", Singer: " + this.singerName + ", Guitarist: " + this.guitarName + ", Bassist: " + this.bassistName + 
         ", Drummer: " + this.drummerName + ", Hometown: " + this.Hometown + ", Income: " + this.income + ", Genre: " + 
         this.genre + ", Final Score: " + this.score; 

    return bandInfo; 
} 
} 

Answer 1

for (int i = 0; i < 5; i++) { 
    String bandInfo = bands[i].getInfo(); 
} 

getInfo()はBandsクラスのインスタンスメソッドです。 したがって、メソッドを呼び出すためにバンドのインスタンスを使用する必要があります。

bands[i]はバンドオブジェクトを参照します。