public static void main(String[] args) {
Father f = new Father();
f.fathMathod();
Father fs = new Son();
fs.fathMathod();
Son son = new Son();
son.fathMathod();
son.sonMathod();
System.out.println(son.father);
/** 子类的对象不具有父类的私有的属性或方法 */
// System.out.println(son.prifat);
/** 子类的对象不可以由父类产生 */
// Son sf = (Son) new Father();
// sf.fathMathod();
// sf.sonMathod();
double d = 8.0934d;
int i = (int) d;
int ii = 4;
double dd = ii;
Integer integer = new Integer(5);
Double double1 = new Double(integer);
System.out.println(d);
System.out.println(i);
System.out.println(dd);
System.out.println(double1);
}
/** @param args */
public static void main(String[] args) {
Father f1 = new Father("f1");
Father f2 = new Father("f2");
Son s1 = new Son("s1");
Son s2 = new Son("s2");
Pair<Father> p1 = new Pair<Father>(f1, f2);
Pair<Son> p2 = new Pair<Son>(s1, s2);
printFather(p1);
// 下面的语句会有编译错
// printFather(p2);
// printSon(p1);
printSon(p2);
printAll(p1);
printAll(p2);
/*
* 使用Pair<? extends Father>类型将不可以调用set方法
* 编译器只知道它需要某个Father的子类型，但是不知道具体是什么类型
* 它拒绝传递任何特定的类型；但get方法是安全可用的
*/
Pair<? extends Father> pair = p2;
// 下面的语句会有编译错
// pair.setFirst(s1);
Father f3 = pair.getFirst();
System.out.println(f3.getName());
}
public Father getPatriarch() {
Father elder = father;
while (elder != null) {
if (elder == this) {
throw new IllegalStateException("Impossible state"); // fail fast during infinite loop
}
elder = elder.getFather();
}
return elder;
}
public String getRelationship(String name1, String name2, Person head) {
Person firstPerson = personManager.getPersonWithName(head, name1);
Person secondPerson = personManager.getPersonWithName(head, name2);
String relation =
Father.isFather(firstPerson, secondPerson)
? RelationEnum.FATHER.toString()
: Mother.isMother(firstPerson, secondPerson)
? RelationEnum.MOTHER.toString()
: Son.isSon(firstPerson, secondPerson)
? RelationEnum.SON.toString()
: Daughter.isDaughter(firstPerson, secondPerson)
? RelationEnum.DAUGHTER.toString()
: Brothers.isBrother(firstPerson, secondPerson)
? RelationEnum.BROTHERS.toString()
: Sisters.isSister(firstPerson, secondPerson)
? RelationEnum.SISTERS.toString()
: GrandDaughter.isGrandDaughter(firstPerson, secondPerson)
? RelationEnum.GRANDDAUGHTER.toString()
: PaternalUncle.isPaternalUncle(firstPerson, secondPerson)
? RelationEnum.PATERNALUNCLE.toString()
: PaternalAunt.isPaternalAunt(firstPerson, secondPerson)
? RelationEnum.PATERNALAUNT.toString()
: MaternalUncle.isMaternalUncle(
firstPerson, secondPerson)
? RelationEnum.MATERNALUNCLE.toString()
: MaternalAunt.isMaternalAunt(
firstPerson, secondPerson)
? RelationEnum.MATERNALAUNT.toString()
: SisterInLaw.isSisterInLaw(
firstPerson, secondPerson)
? RelationEnum.SISTERINLAW.toString()
: BrotherInLaw.isBrotherInLaw(
firstPerson, secondPerson)
? RelationEnum.BROTHERINLAW.toString()
: Cousins.isCousin(
firstPerson, secondPerson)
? RelationEnum.COUSINS.toString()
: null;
return relation;
}
@Test
public void testOrderedList() throws Exception {
Session session = openSession();
Transaction tx = session.beginTransaction();
Child luke = new Child();
luke.setName("Luke");
Child leia = new Child();
leia.setName("Leia");
session.persist(luke);
session.persist(leia);
Father father = new Father();
father.getOrderedChildren().add(luke);
father.getOrderedChildren().add(null);
father.getOrderedChildren().add(leia);
session.persist(father);
tx.commit();
session.clear();
tx = session.beginTransaction();
father = (Father) session.get(Father.class, father.getId());
assertThat(father.getOrderedChildren()).as("List should have 3 elements").hasSize(3);
assertThat(father.getOrderedChildren().get(0).getName())
.as("Luke should be first")
.isEqualTo(luke.getName());
assertThat(father.getOrderedChildren().get(1)).as("Second born should be null").isNull();
assertThat(father.getOrderedChildren().get(2).getName())
.as("Leia should be third")
.isEqualTo(leia.getName());
session.delete(father);
session.delete(session.load(Child.class, luke.getId()));
session.delete(session.load(Child.class, leia.getId()));
tx.commit();
session.close();
checkCleanCache();
}
public int getWeightOfFather() {
if (father == null) {
return 0;
}
return father.getWeight();
}