目录
1、 学生类的定义:
public class Student {
int id;
int age;
int grade;
public void study() {
System.out.println("学号为"+id+"的学生正在学习。");
}
public void examination(){
System.out.println(grade+"年纪正在考试。");
}
public void tell(){
System.out.print("正在讲话的是一个"+age+"岁的学生。");
}
}
2、复数运算:
public class Complex {
int real1,image1,real2,image2;
String add() {
int real=real1+real2;
int image=image1+image2;
if(real!=0&&image!=0) {
return real+"+"image+"i";
}
else if(real!=0&&image==0) {
return real+"";
}
else if(real==0&&image!=0) {
return image+"i";
}
else {
return "0";
}
}
}
3、检验三边是否构成三角形:
import java.util.Scanner;
public class Triangle {
static void judge(double a,double b,double c) {
if(a+b>c&&a+c>b&&b+c>a) {
System.out.print("这三条边可以构成三角形");
}
else {
System.out.print("这三条边不能构成三角形");
}
}
public static void main(String[] args) {
Scanner sc=new Scanner(System.in);
double a=sc.nextDouble();
double b=sc.nextDouble();
double a=sc.nextDouble();
judge(a,b,c);
}
}
4、this关键字
public class Shop {
double price;
int total;
public Shop(double price,int total) {
this.price=price;
this.total=total;
}
public double sum() {
double s=price*total;
return s;
}
}
public class Student {
String name;
int age;
public int getAge() {
return age;
}
public void setAge(int age) {
this.age=age;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name=name;
}
public void info() {
System.out.println("学生姓名:"+name+",年龄:"+age);
}
}