Java @Override hashCode() equals()

Test有三个变量String的name，int的salary，double的weight

public class Test {

    private final String name;
    private final int salary;
    private final double weight;

Constructor

    public Test(String name, int salary, double weight) {
        this.name = name;
        this.salary = salary;
        this.weight = weight;
    }

equals实现

    @Override public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }

        Test test = (Test) o;

        if (name != null ? !name.equals(test.name) : test.name != null) {
            return false;
        }
        if (!Double.valueOf(weight).equals(Double.valueOf(test.weight))) {
            return false;
        }
        return salary == test.salary;
    }

hashCode实现

    @Override public int hashCode() {
        int result = (name != null ? name.hashCode() : 0);
        result = 31 * result + salary;
        result = 31 * result + Double.valueOf(weight).hashCode();
        return result;
    }
}