目录
🏀关于IDEA工具的快捷键以及一些简单的设置
🥅project---Module---class三板斧
❤️（1）创建新的项目工程：
❤️（2）在空的工程创建一个Module(模块)
❤️（3）编写代码，在src目录下(右击鼠标)新建类(例如：Helloworld)，写代码运行
自动生成类！
🥅IDEA常用快捷键
❤️一般设置
❤️常用快捷键设置
🥅小试牛刀
public class HomeWork01 {
public static void main(String[] args) {
//方法1：调用无参构造方法
Vehicle v = new Vehicle();
v.setSpeed(110);
v.setSize(10);
//打印
System.out.println("speed:"+v.getSpeed());
System.out.println("size:"+v.getSize());
//加速speedUp()
v.speedUp(20);
System.out.println("speed:"+v.getSpeed());
//减速speedDown()
v.speedDown(30);
System.out.println("speed:"+v.getSpeed());
}
}
class Vehicle{
private int speed;
private int size;
//构造方法
public Vehicle() {
}
public Vehicle(int speed, int size) {
this.speed = speed;
this.size = size;
}
//getter 和 setter方法
public int getSpeed() {
return speed;
}
//设置速度(setSpeed(int speed))
public void setSpeed(int speed) {
this.speed = speed;
}
public int getSize() {
return size;
}
public void setSize(int size) {
this.size = size;
}
// 方法移动(move())
public void move(){
}
// 加速speedUp()
public void speedUp(int addSpeed){
this.setSpeed(addSpeed+this.getSpeed());
}
// 减速speedDown()
public void speedDown(int addSpeed){
if(this.getSpeed() > addSpeed)
{
this.setSpeed(this.getSpeed()-addSpeed);
}else{
this.setSpeed(0);
}
}
}
public class HomeWork02 {
public static void main(String[] args) {
Number num = new Number(10,2);
num.add();
num.sub();
num.mul();
num.div();
}
}
class Number{
private int n1;
private int n2;
//构造方法
public Number() {
}
public Number(int n1, int n2) {
this.n1 = n1;
this.n2 = n2;
}
//getter和setter方法
public int getN1() {
return n1;
}
public void setN1(int n1) {
this.n1 = n1;
}
public int getN2() {
return n2;
}
public void setN2(int n2) {
this.n2 = n2;
}
//定义加add()、减sub()、乘mul()、除div()等公有实例方法
public void add(){
System.out.println(this.getN1()+"+"+this.getN2()+"="+(this.getN1()+this.getN2()));
}
public void sub(){
System.out.println(this.getN1()+"-"+this.getN2()+"="+(this.getN1()-this.getN2()));
}
public void mul(){
System.out.println(this.getN1()+"*"+this.getN2()+"="+(this.getN1()*this.getN2()));
}
public void div(){
if(n2 == 0){
System.out.println("除数不能为0");
return;
}
System.out.println(this.getN1()+"/"+this.getN2()+"="+(this.getN1()/this.getN2()));
}
}public class HomeWork03 {
public static void main(String[] args) {
//调用有参的
Person p = new Person("张三",18);
p.display();
//调用无参的
Person p1 = new Person();
p1.setName("李四");
p1.setAge(22);
p1.display();
}
}
class Person{
private String name;
private int age;
//构造方法
public Person() {
}
public Person(String name, int age) {
this.name = name;
this.age = age;
}
//getter和setter方法
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
//定义显示display方法将姓名和年龄打印出来。
public void display(){
//三种方法都可以
System.out.println("姓名："+this.getName()+","+"年龄："+this.getAge());
System.out.println("姓名："+this.name+","+"年龄："+this.age);
System.out.println("姓名："+name+","+"年龄："+age);
}
}
public class HomeWork04 {
public static void main(String[] args) {
MyTime m = new MyTime(6,30,30); //6 30 30
m.display(); //6时30分30秒
//增加：hour、minute、second
m.addHour(1);
m.display();//7时30分30秒
m.addMinute(40);
m.display();//8时10分30秒
m.addSecond(40);
m.display();//8时11分10秒
System.out.println("--------------------------");
m.addHour(22);
m.display();//6时11分10秒
m.addMinute(140);
m.display();//8时31分10秒
m.addSecond(140);
m.display();//8时33分30秒
System.out.println("--------------------------");
//减少：hour、minute、second
m.subHour(1);
m.display();//7时33分30秒
m.subMinute(21);
m.display();//7时12分30秒
m.subSecond(30);
m.display(); //7时12分0秒
System.out.println("--------------------------");
m.subHour(8);
m.display();//23时12分0秒
m.subMinute(151);
m.display();//21时19分0秒
m.subSecond(150);
m.display(); //21时17分30秒
}
}
class MyTime{
private int hour;
private int minute;
private int second;
//构造方法
public MyTime() {
}
public MyTime(int hour, int minute, int second) {
this.hour = hour;
this.minute = minute;
this.second = second;
}
//getter和setter方法
public int getHour() {
return hour;
}
public void setHour(int hour) {
this.hour = hour;
}
public int getMinute() {
return minute;
}
public void setMinute(int minute) {
this.minute = minute;
}
public int getSecond() {
return second;
}
public void setSecond(int second) {
this.second = second;
}
//增加小时 addHour(int hou)
public void addHour(int hou){
if((this.getHour()+hou)<24) {
this.setHour(this.getHour() + hou);
}else{
int newHour = this.getHour() + hou;
this.setHour(newHour % 24);
}
}
//减少小时 subHour(int hou)
public void subHour(int hou){
if(hou > this.getHour()){
this.setHour(this.getHour() - hou+24);
}else{
this.setHour(this.getHour() - hou);
}
}
//增加分钟 addMinute(int min)
public void addMinute(int min){
if((this.getMinute()+min) < 60){
this.setMinute(this.getMinute()+min);
}else {
int newMin = this.getMinute()+min;
this.setMinute(newMin%60);
this.setHour(this.getHour()+newMin/60);
}
}
//减少分钟 subMinute(int min)
public void subMinute(int min){
if(min > this.getMinute())
{
int newMin = min-this.getMinute();
this.setMinute(newMin%60);
this.setHour(this.getHour() - newMin/60);
}else{
this.setMinute(this.getMinute()-min);
}
}
//增加秒 addSecond(int sec)
public void addSecond(int sec){
if((this.getSecond()+sec) <60) {
this.setSecond(this.getSecond() + sec);
}else{
int newSec = this.getSecond() + sec;
this.setSecond(newSec%60);
this.setMinute(this.getMinute() + newSec/60);
}
}
//减少秒 subSecond(int sec)
public void subSecond(int sec){
if(sec > this.getSecond()){
int newSec = sec - this.getSecond();
this.setSecond(newSec%60);
this.setMinute(this.getMinute()-newSec/60);
}else{
this.setSecond(this.getSecond()-sec);
}
}
//定义diaplay方法用于将时间信息打印出来。
public void display(){
System.out.println(this.getHour()+"时"+this.getMinute()+"分"+this.getSecond()+"秒");
}
}
