為什么我的代碼將 null 作為輸出值而不是傳遞的參數(shù)？家長(zhǎng)班級(jí)：class Language{ protected String name; protected int numSpeakers; protected String regionsSpoken; protected String wordOrder; public Language(String getName, int getNumSpeakers, String getRegionsSpoken, String getWordOrder){ this.name = getName; this.numSpeakers = getNumSpeakers; this.regionsSpoken = getRegionsSpoken; this.wordOrder = getWordOrder; } public void getInfo(){ System.out.println(name+ " is spoken by "+numSpeakers+" people mainly in "+regionsSpoken); System.out.println("The language follows the word order: "+wordOrder); } public static void main(String[] args){ Mayan mayanLanguage = new Mayan("Ki'che'",30000); mayanLanguage.getInfo(); }}兒童班：class Mayan extends Language { protected String name; protected int numSpeakers; Mayan(String languageName,int speakers ){ super(languageName,speakers,"Central America","verb-object-subject"); } @Override public void getInfo() { System.out.println(name+" is spoken by "+numSpeakers+" people mainly in Central America."); System.out.println("The language follows the word order: verb-object-subject"); System.out.println("Fun fact: "+name+" is an ergative language."); }}我查看了代碼并嘗試通過(guò)更改來(lái)解決它，但似乎沒(méi)有任何效果，我陷入了代碼中沒(méi)有看到的錯(cuò)誤是什么。預(yù)期是：Ki'che' 有 2330000 人使用，主要分布在中美洲。該語(yǔ)言遵循詞序：動(dòng)詞-賓語(yǔ)-主語(yǔ) 有趣的事實(shí)：Ki'che' 是一種作格語(yǔ)言。實(shí)際是：null 主要在中美洲有 0 人使用。該語(yǔ)言遵循詞序：動(dòng)詞-賓語(yǔ)-主語(yǔ) 有趣的事實(shí)：null 是一種作格語(yǔ)言。
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TA貢獻(xiàn)1793條經(jīng)驗(yàn) 獲得超6個(gè)贊
在Mayan你有領(lǐng)域
protected String name;
protected int numSpeakers;
刪除這些將解決您的問(wèn)題。發(fā)生此問(wèn)題的原因是因?yàn)楫?dāng)您定義上面的兩行時(shí)，您隱藏了這兩個(gè)字段，Language并且您必須從Languagelike super.name、super.numSpeakers等訪(fǎng)問(wèn)這些字段...
您可能正在追求類(lèi)似以下的內(nèi)容。
public class Mayan extends Language {
private static final String REGION = "Central America";
private static final String WORD_ORDER = "verb-object-subject";
public Mayan(String languageName, int speakers) {
super(languageName, speakers, REGION, WORD_ORDER);
}
@Override
public void getInfo() {
super.getInfo();
System.out.println("Fun fact: " + name + " is an ergative language.");
}
}
正如加文指出的，訪(fǎng)問(wèn)修飾符可以受到限制。如果您在程序的單個(gè)包中工作，您最終可能會(huì)得到類(lèi)似的結(jié)果
Language.java
class Language {
String name;
private int numSpeakers;
private String regionsSpoken;
private String wordOrder;
Language(String getName, int getNumSpeakers, String getRegionsSpoken, String getWordOrder) {
this.name = getName;
this.numSpeakers = getNumSpeakers;
this.regionsSpoken = getRegionsSpoken;
this.wordOrder = getWordOrder;
}
void getInfo() {
System.out.println(name + " is spoken by " + numSpeakers + " people mainly in " + regionsSpoken);
System.out.println("The language follows the word order: " + wordOrder);
}
public static void main(String[] args) {
Mayan mayanLanguage = new Mayan("Ki'che'",30000);
mayanLanguage.getInfo();
}
}
Mayan.java
class Mayan extends Language {
private static final String REGION = "Central America";
private static final String WORD_ORDER = "verb-object-subject";
Mayan(String languageName, int speakers) {
super(languageName, speakers, REGION, WORD_ORDER);
}
@Override
void getInfo() {
super.getInfo();
System.out.println("Fun fact: " + name + " is an ergative language.");
}
}
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