java - Java 如何从 HashMap 中获取对象

Question

我正在尝试在给定 key 时从 HashMap 获取测试对象的速度，但我不太确定该怎么做。我试过这种方式，但它是错误的:

hash.values().getSpeed();

有什么帮助吗？谢谢

class Test {

            private String id;
            private String name;
            private int speed;

            public Test(String id, String name, int speed) {
                this.id = id;
                this.name = name;
                this.speed = speed;

            }

            public String getId() {
                return id;
            }

            public String getName() {
                return name;

            }

            public int getSpeed() {
                return speed;
            }
        }    
    public class Driver {    
    public static void main(String[] args) {
        HashMap<String, Test> hash = new HashMap<String, Test>();

            Test c1;
            Test c2;

            c1 = new Test("Z", "B", 4);
            c2 = new Test("Y", "D", 7);
            hash.put("A", c1);
            hash.put("C", c2);
    }
}

Answer 1

Test c1;
Test c2;

c1 = new Test("Z", "B", 4);
c2 = new Test("Y", "D", 7);
hash.put("A", c1);
hash.put("C", c2);

Test getC1 = (Test)hash.get("A");
Test getC2 = (Test)hash.get("C");