/**
 * 使用Objects.equal帮助执行null敏感的equals判断，从而避免抛出NullPointerException
 * 注意：JDK7引入的Objects类提供了一样的方法Objects.equals
 */
public static void equalsMethod() {
    // returns true
    Objects.equal("a", "a");
    // returns false
    Objects.equal(null, "a");
    // returns false
    Objects.equal("a", null);
    // returns true
    Objects.equal(null, null);

}

/**
 * 对传入的字段序列计算出合理的、顺序敏感的散列值
 * 可以使用Objects.hashCode(field1, field2, …, fieldn)来代替手动计算散列值
 * 注意：JDK7引入的Objects类提供了一样的方法Objects.hash(Object...)
 */
public static void hashCodeMethod() {
    int hash = Objects.hashCode(2, "hello", null);
    System.out.println(hash);
}

/**
 * 轻松编写有用的toString方法
 */
public void toStringHelperMethod() {

    // Returns "ClassName{x=1}"
    String s1 = MoreObjects.toStringHelper(this)
            .add("x", 1)
            .toString();
    System.out.println(s1);

    // Returns "MyObject{x=1}"
    String s2 = MoreObjects.toStringHelper("MyObject")
            .add("x", 1)
            .toString();
    System.out.println(s2);

}

class Person implements Comparable<Person> {
    String name;
    int age;
    public Person(String name, int age) {
        this.name = name;
        this.age = age;
    }

    /**
     * 执行比较操作直至发现非零的结果，在那之后的比较输入将被忽略
     * @param that
     * @return
     */
    public int compareTo(Person that) {
        return ComparisonChain.start()
                .compare(this.age, that.age)
                .compare(this.name, that.name)
                .result();
    }
}
public void compare() {
    Person a = new Person("a", 10);
    Person b = new Person("a", 10);
    // Returns 1
    System.out.println(b.compareTo(a));
}