CharSequence遇到問題

我剛剛開始研究如何編碼2個星期前，我似乎遇到了使用CharSequence的想法的麻煩。CharSequence遇到問題

我正在編寫一個基於電視節目權力遊戲的簡單程序，它可以讓我打印出姓名，他們的忠誠以及他們是否活着或已故使用ArrayList。

這是我的人物類：

import java.util.ArrayList; 

public class Characters { 

/* Fields */ 
private String name; 
private String allegiance; 
private String status; 
private int seasonSeen; 


/* Constructor */ 
public Characters(String name, String allegiance, String status, int seasonSeen) { 
    this.name = name; 
    this.allegiance = allegiance; 
    this.status = status; 
    this.seasonSeen = seasonSeen; 
} 

/* Methods */ 

public String getName() { 
    return name; 
} 

public String getallegiance() { 
    return allegiance; 
} 

public String getStatus() { 
    return status; 
} 

public int getseasonSeen() { 
    return seasonSeen; 
} 

}

這是我的測試類

import java.util.ArrayList; 

public class TestGoTCharacters { 

public static void main(String[] args) { 


// create an arraylist called character 
ArrayList<Characters> character = new ArrayList<Characters>(); 

    // character paramaters(name, allegiance, status, season appearance) into the arraylist 
    character.add(new Characters("Jon Snow", "House Stark, The Nights Watch", "Alive", 1)); 
    character.add(new Characters("Neddard Stark", "House Stark", "Deceased", 1)); 
    character.add(new Characters("Arya Stark", "House Stark, Faceless Men", "Alive", 1)); 
    character.add(new Characters("Catelyn Stark", "House Stark", "Deceased", 1)); 
    character.add(new Characters("Sansa Stark", "House Stark", "Alive", 1)); 
    character.add(new Characters("Bran Stark", "House Stark", "Alive", 1)); 
    character.add(new Characters("Rickon Stark", "House Stark", "Deceased", 1)); 
    character.add(new Characters("Cersei Lannister","House Lannister, House Baratheon", "Alive", 1)); 
    character.add(new Characters("Jamie Lannister", "House Lannister, Kingsguard", "Alive", 1)); 
    character.add(new Characters("Tyrion Lannister", "House Lannister, House Targaryen", "Alive", 1)); 
    character.add(new Characters("Tywin Lannister", "House Lannister", "Deceased", 1)); 
    character.add(new Characters("Robert Baratheon", "House Baratheon, House Baratheon of Kings Landing", "Deceased", 1)); 
    character.add(new Characters("Stannis Baratheon", "House Baratheon, House Baratheon of Dragonstone", "Deceased", 2)); 
    character.add(new Characters("Renly Baratheon", "House Baratheon", "Deceased", 1)); 
    character.add(new Characters("Melissandre", "The lord of light", "Alive", 2)); 
    character.add(new Characters("Margaery Tyrell", "House Tyrell, House Baratheon, House Baratheon of Kings Landing", "Deceased", 2)); 
    character.add(new Characters("Sandor 'The Hound' Clegane", "House Baratheon of Kings Landing, Brotherhood without Banners", "Alive", 1)); 
    character.add(new Characters("Joffrey Baratheon", "House Baratheon of Kings Landing, House Lannister", "Deceased", 1)); 
    character.add(new Characters("Gregor 'The Mountain' Clegane", "House Lannister", "Alive", 1)); 
    character.add(new Characters("Khal Drogo", "Dothraki", "Deceased", 1)); 
    character.add(new Characters("Benjen Stark", "House Stark, The Nights Watch", "Alive", 1)); 
    character.add(new Characters("Ramsay Bolton", "House Bolton", "Deceased", 3)); 
    character.add(new Characters("Daenarys Targayen", "House Targaryen", "Alive", 1)); 
    character.add(new Characters("Viserys Targaryen", "House Targaryen", "Deceased", 1)); 
    character.add(new Characters("Rhaegar Targaryen", "House Targaryen", "Deceased", 7)); 
    character.add(new Characters("Petyr Baelish", "House Baelish", "Alive", 1)); 
    character.add(new Characters("Robb Stark", "House Stark", "Deceased", 1)); 
    character.add(new Characters("Theon Greyjoy", "House Targaryen, House Stark, House Greyjoy", "Alive", 1)); 
    character.add(new Characters("Yara Greyjoy", "House Greyjoy", "Alive", 2)); 



    /* method that reads out names in the array list */ 
    /* 
    int count = 1; 
    System.out.println("Some of the characters in Game of Thrones, are: "); 
    for (int i = 0; i < character.size(); i++) { 
     System.out.println(count + ". " + character.get(i).getName()); 
     count = count + 1; 
    } 
    */ 


    /* method that finds house allegiances */ 

    System.out.println("\n"); // create a line space 
    System.out.println("The following characters are loyal to House Stark: "); 
    CharSequence HouseStark = "House Stark"; // if Allegiance contains House Stark then, print the name 
    for (int i = 0; i < character.size(); i++) { 
     // if (characer.get(i_.getallegiance() == "House Stark") 
     if (character.get(i).getallegiance() == HouseStark)// compares if allegiance paramters is true (equals house stark) 
      System.out.println(character.get(i).getName()); 
    } 



    /* method that finds deceased */ 

    /* method that finds characters seen in season 1 */ 

    /* method that finds characters seen other than season 1 */ 

} 
}

這是它讀，但我似乎看到的字符，如「瓊恩·雪諾」不盡管我在參數「House Stark，The Nights Watch」中提到了輸出，但我還是提到了這個問題

The following characters are loyal to House Stark: 
Neddard Stark 
Catelyn Stark 
Sansa Stark 
Bran Stark 
Rickon Stark 
Robb Stark

來源

2017-01-25 iVince905

我不知道這是否'新的字符（「喬恩·雪」，「史塔克，夜晚觀察」，「活着」，1）'決心成？當只有'/ * Constructor */ public characters（String name，String allegiance，String status，int seasonSeen）' – nullpointer

也爲什麼你甚至要使用CharSequence？http：//stackoverflow.com/questions/1049228/ charsequence-vs-string-in-java – nullpointer

你有一個通訊一個在「Jon Snow」的效忠（超過一個值，所以他們不相等）。 allegiance是String，所以你能使用String.contains像

if (character.get(i).getallegiance().contains(HouseStark))

來源

2017-01-25 05:00:09

kk謝謝它的工作！ – iVince905

CharSequence遇到問題

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