转换Integer以打印字符串的最佳方式

Question

我有一个小问题，可能很愚蠢。我不确定如何处理这个问题。我想弄清楚如何转换Integer，以便打印出下面单元测试中的String我不允许使用枚举，因为确切的问题是要求将其表示为整数。我需要一个HashMap，还是只需要简单的switch语句？当我运行单元测试时，我需要它打印出来：

Cat (Ragdoll: House Cat) is 1 year old, is 30 units fast.

但目前正在打印：

Cat (Ragdoll: 3) is 1 year old, is 30 units fast.

Cat类(我删除了不相关的方法(：

public class Cat extends Animal { 

private Integer type;
private String breed;
static final Integer LION = 1;
static final Integer TIGER = 2;
static final Integer HOUSE_CAT = 3;
static final Integer PUMA = 4;

public Cat(int age, int speed, Integer type, String breed){
super(age, speed);
this.type = type;
this.breed = breed;
}
public String getBreed() {
return breed;
}
public Integer getType() {
return type;
}
public String toString() {
return ("Cat (" + breed + ": " + type + ")" + super.toString());
}
}

单元测试(可以在Dog类中使用枚举，因此没有问题(。

@Test
void testAllParts() {
Animal dog = new Dog(12, 30, Dog.type.GUNDOG, "Irish Setter");
Animal cat = new Cat(1, 30, Cat.HOUSE_CAT, "Ragdoll");

assertTrue(dog.isOlder(cat));
assertFalse(cat.isOlder(dog));

assertFalse(dog.isFaster(cat));
assertFalse(cat.isFaster(dog));

assertEquals("Dog (Irish Setter: GUNDOG) is 12 years old, is 30 units fast.", dog.toString());
assertEquals("Cat (Ragdoll: House Cat) is 1 year old, is 30 units fast.", cat.toString());

assertFalse(dog.equals(cat));

Animal [] a = dog.multiply(2);
assertEquals(a[0], a[1]);
assertFalse(dog.equals(a[0]));
assertEquals(2, a.length);

a = cat.multiply(2);
assertEquals(a[0], a[1]);
assertFalse(cat.equals(a[0]));
assertEquals(2, a.length);

}

Answer 1

在这里使用enum是显而易见的选择，但由于您声明不能使用它们，因此可以使用从值到名称的Map：

private static final Map<Integer, String> TYPES = 
Map.of(1, "Lion",
2, "Tiger",
3, "House cat",
4, "Puma");

然后将其用于toString方法：

public String toString() {
return ("Cat (" + breed + ": " + TYPES.get(type) + ")" + super.toString());
}