摘要： package 多态类运用; abstract class MyShape{ public abstract void getArea(); public abstract void getLength(); } class Circla extends MyShape{ public static 阅读全文

摘要： package 抽象类运用; abstract class MyShape{ String name; public MyShape(String name) { this.name = name; } public abstract void getArea(); public abstract 阅读全文

摘要： package 抽象内的运用;abstract class animal{ String name; String color; public animal(String name,String color) { this.name=name; this.color=color; } public 阅读全文

摘要： package 继承运用;class Student{ String studentclass="学生"; int id; String name; String boredTime; public Student(int id, String name, String boredTime) { t 阅读全文

摘要： class Circle{ double r; double pi=3.14; public Circle(double r) { this.r = r; } public void Getarea() { System.out.println("狗蛋同学算出来的圆的面积为:"+r*r*pi); } 阅读全文

摘要： package 时间表;import java.util.Date; public class Eval { public static void main(String[]args) { Date date = new Date(); String year = String.format("%t 阅读全文

摘要： package 四则运算;class Calculator{ private int num1; private int num2; private char option ; public void initCalculator(int num1,int num2,char o) { this.n 阅读全文

摘要： class Student { private int id; public String name; public String sex; private int score; public void setId(int id) { this.id = id; } public int getId 阅读全文