Question

我是java的新手，并且在嵌套类方面遇到了一些困难。我在main方法（comp1）中创建了我的内部类的实例但是当我尝试在另一个打印输出（doCompOutput）的方法中引用它时，我得到一个错误，它找不到符号comp1或方法doCompOutput

public class Team{

private  String teamName;
private  String name1, name2, name3, name4;

public Team(String _teamName, String _name1, String _name2, String _name3, String _name4){
    setTeam(_teamName, _name1, _name2, _name3, _name4);
}
public void setTeam(String _teamName, String _name1, String _name2, String _name3, String _name4){
    teamName = _teamName;
    name1 = _name1;
    name2 = _name2;
    name3 = _name3;
    name4 = _name4;
}
***TEAM GET METHODS REMOVED TO SHORTEN CODE***

public static void doTeamOutput(){
    System.out.println(team1.getTeamName() + team1.getName1() + team1.getName2() + team1.getName3() + team1.getName4());
}

public static void main(String[] args){
    Team team1 = new Team("Spartans", "chase", "mark", "matt", "jake");
    doTeamOutput();
    Team team2 = new Team("Warriors", "john", "paul", "george", "ringo");
    doTeamOutput();
    Competition comp1 = new Competition("Alpha","Spartans","Warriors",2013);
    doCompOutput();
}

static class Competition {
    String compName;
    String winner;
    String runner;
    int year;

    public Competition(String _compName, String _winner, String _runner, int _year){
        setComp(_compName, _winner, _runner, _year); //set
    }
    public void setComp(String _compName, String _winner, String _runner, int _year){
        compName = _compName;
        winner = _winner;
        runner = _runner;
        year = _year;
    }
    public static void doCompOutput(){
        System.out.println(comp1.getName());
     }
    public String getName()
        return compName;

    ***COMP GET METHODS MOVED TO SHORTED CODE***    
}

}

Answer 1

你的方法doCompOutput（）试图在编译器不知道的对象上调用方法getName（）。

public static void doCompOutput(){
    System.out.println(this.getName());
}

使用该代码，该方法将输出您调用方法的对象的compName。

您的代码有很多错误。您应该查看一些关于the basics of Java

的教程

引用嵌套类Java中main方法中创建的对象

1 个答案: