Java 自学日记

不死猫 · 发表于 2012-7-29 16:08:00

上面这贴是我家孩子的回复。

private 不可复写,相当于局部的方法。
super访问父类方法

看过继承应用，默写一套

public class Test {
public static void main(String[] args){
//ReverseArray ar = new ReverseArray(5);
SortArray ar = new SortArray(5);
System.out.print(ar.add(2) + "\t");
System.out.print(ar.add(1) + "\t");
System.out.print(ar.add(5) + "\t");
System.out.print(ar.add(3) + "\t");
System.out.print(ar.add(4) + "\t");
System.out.print(ar.add(6) + "\t");
print(ar.getArray());
}
public static void print (int a[]){
for (int i = 0;i < a.length;i++){
System.out.print(a[i]);
}
}
}
class Array{
private int temp[];
private int num = 0;
public Array(int s){
if (s < 1){
this.temp = new int[1];
}else{
this.temp = new int[s];
}
}
public boolean add(int s){
if (temp.length <= num){
return false;
}else{
temp[num]=s;
num++;
return true;
}
}
public int[] getArray(){
return temp;
}
}
class ReverseArray extends Array{
public ReverseArray(int len){
super(len);
}
public int[] getArray(){
int re[] = new int[super.getArray().length];
for (int i = 0;i<re.length;i++){
re[i]=super.getArray()[super.getArray().length - i - 1];
}
return re;
}
}
class SortArray extends Array{
public SortArray(int len){
super(len);
}
public int[] getArray(){
java.util.Arrays.sort(super.getArray());
return super.getArray();
}
}

nonsmall · 发表于 2012-7-30 00:32:53

抽象类看过默写

public class Test {
public static void main(String[] args){
B b = new B("123");
b.print();
}
}
abstract class A{
public static final String DogName = "god";
private String name = "123";
public String getName(){
return name;
}
public void setName(String name){
this.name = name;
}
abstract void print();
}
class B extends A{
public B(String name){
super.setName(name);
}
void print() {
System.out.print(DogName);
System.out.print(super.getName());
}
}

不死猫 · 发表于 2012-7-30 09:48:06

再虚一个
public class Test {
public static void main(String[] args) {
Student st = new Student("a" , 1, "2");
st.print();
}
}
abstract class Person{
private String name;
private int age;
public Person(String name,int age){
this.name = name;
this.age = age;
}
public String getName(){
return name;
}
public int getAge(){
return age;
}
abstract public void print();
}
class Student extends Person{
private String school;
public Student(String name,int age,String school){
super(name,age);
this.school = school;
}
public void print(){
System.out.print(getName() + getAge() + school);
}
}

不死猫 · 发表于 2012-7-30 17:42:36

接口基础
public class Test{
public static void main(String args[]){
S s = new S();
s.printA();
s.printB();
s.printC();
s.printD();
s.printE();
}
}
interface A {
public void printA();
}
interface B {
public void printB();
}
interface C extends A,B{
public void printC();
}
interface D {
public void printD();
public static final String OK = "ok";
}
abstract class E implements D{
abstract void printE();
}
class S extends E implements C{
public void printA(){
System.out.print("A");
}
public void printB(){
System.out.print("B");
}
public void printC(){
System.out.print("C");
}
public void printD(){
System.out.print("D");
}
public void printE(){
System.out.print(OK);
}
}

不死猫 · 发表于 2012-7-31 18:02:47

开会很痛苦，一开一上午。
看一遍理解后再默写了一通
从6.7写到6.93

不死猫 · 发表于 2012-8-5 01:42:52

20120805 奥运会的20公里竞走搞定金牌
宠物商店案例默写

interface Pet{
public String getName();
public String getColor();
public int getAge();
}
class Cat implements Pet{
String name;
String color;
int age;
public Cat(String name,String color,int age){
this.name = name;
this.color = color;
this.age = age;
}
public String getName(){
return this.name;
}
public String getColor(){
return this.color;
}
public int getAge(){
return this.age;
}
}
class Dog implements Pet{
String name;
String color;
int age;
public Dog(String name,String color,int age){
this.name =name;
this.color = color;
this.age =age;
}
public String getName(){
return this.name;
}
public String getColor(){
return this.color;
}
public int getAge(){
return this.age;
}
}
class PetShop{
Pet[] ps= null;
int foot = 0;
public PetShop(int num){
if(num < 1){
this.ps = new Pet[1];
}
else
{
this.ps = new Pet[num];
}
}
public boolean Add(Pet ps){
if (this.ps.length > foot){
this.ps[foot] = ps;
foot++;
return true;
}else{
return false;
}
}
public Pet[] Search(String content){
Pet[] temp = null;
int num =0;
for (int i = 0;i<this.ps.length;i++){
if(this.ps[i] != null){
if (this.ps[i].getName().indexOf(content) != -1 ||
this.ps[i].getColor().indexOf(content) != -1)
{
num++;
}
}
}
temp = new Pet[num];
num = 0;
for (int i = 0;i<this.ps.length;i++){
if(this.ps[i] != null){
if (this.ps[i].getName().indexOf(content) != -1 ||
this.ps[i].getColor().indexOf(content) != -1)
{
temp[num] = ps[i];
num++;
}
}
}
return temp;
}
}
public class Test{
public static void main(String[] args){
PetShop ps = new PetShop(5);
ps.Add(new Cat("白猫","2",2));
ps.Add(new Cat("黑猫","2",2));
ps.Add(new Dog("白狗","2",2));
ps.Add(new Cat("1","白色",2));
ps.Add(new Cat("1","2",2));
ps.Add(new Cat("1","2",2));
Print(ps.Search("白"));
}
public static void Print(Pet ps[]){
for (int i = 0;i<ps.length;i++){
System.out.print(ps[i].getName() + "\n");
}
}
}

复制代码

风树 · 发表于 2014-7-4 21:57:19

谢谢分享！

Real_King · 发表于 2015-6-16 17:05:46

不错，要是能有CAD WEB ，有平板能开发的CAD就好了

pengfei2010 · 发表于 2017-10-30 11:10:00

回帖是一种美德！感谢楼主的无私分享谢谢

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