java - 关于JAVA中对象的几个问题

Question

我是编程新手，本周我的作业是围绕 Java 中的对象进行的。

首先是我的代码

public class Animal {
float mass;
String name;
int legs;

// Exercise 6-6
public Animal(String randomName) {
    name = randomName;
    legs = 0;
    mass = 0;
}

// Exercise 6-7
public Animal(float one, String two, int three) {
    mass = one;
    name = two;
    legs = three;
}

//Exercise 7
public String toString(){
    return "name =" + name + "legs=" + legs + "mass=" + mass;
}

public void massSetter() {

}

public String getName() {
    return name;
}

public int getLegs() {
    return legs;
}
}

还有这个

public class Zoo {
private Animal[] park;

// Exercise 9
public Zoo() {
    Animal[] park = new Animal[10];
}

// Exercise 10
public void addAnimal(Animal first) {
    for (int i = 0; i < 10; i++) {
        if (park[i] != null) {
            park[i] = first;
            i = 10;
        } else if (i == 9) {
            System.out.println("The zoo is full!");
        }

    }
}

// Exercise 11
public void feed() {
    for (int i = 0; i < 10; i++) {
        park[i].mass *= 1.1;
    }
}

public String toString() {
    return "The zoo is capable of keeping " + park.length + "animals"
            + '\n'
            + "The following is the list of animals currently in the zoo."
            + '\n' + "cage 1 status: " + park[0] + '\n' + "cage 2 status: "
            + park[1] + '\n' + "cage 3 status: " + park[2] + '\n'
            + "cage 4 status: " + park[3] + '\n' + "cage 5 status: "
            + park[4] + '\n' + "cage 6 status: " + park[5] + '\n'
            + "cage 7 status: " + park[6] + '\n' + "cage 8 status: "
            + park[7] + '\n' + "cage 9 status: " + park[8] + '\n'
            + "cage 10 status: " + park[9];
}

public void print() {
    System.out.println(park.toString());
}

public int totalLegs() {
    int totalLeg = 0;
    for (int i = 0; i < 10; i++) {
        totalLeg += park[i].legs;
    }
    return totalLeg;
}
}

最后

public class TestZoo {
public static void main(String[] args){
    Zoo zoo = new Zoo();

}
}

我有两个问题。

首先，正如您从 Zoo 类的 toString 方法中看到的那样，我的返回语句太长了。我尝试使用 for 循环，但我似乎无法在 return 语句中真正做到这一点，所以我想知道是否有任何更简单的方法。

第二个问题是练习告诉我用大象和蜘蛛等名称填充我在 TestZoo 类中创建的对象动物园。我想知道我该怎么做。

Answer 1

1) 您可以使用StringBuilder 并循环构建字符串。请参阅文档 here .
2) 您有方法 addAnimal(Animal first) 用于将动物添加到动物园。