JAVE基础实验 Experiment3

Experimental Class 3Java, Ludong University

Exercise 1Make an executable class called Exercise1, with main method write necessary code to display the following:How Day Day Day Day Day many day’s temperatures? 1’s temperature: 78 2’s temperature: 81 3’s temperature: 75 4’s temperature: 79 5’s temperature: 71 76.8 81 71 5

User input Scanner(System.in)

Average temperature: Maximum temperature: Minimum temperature:

Use: Scanner(System.in)& for loop Use an array to store the values

Exercise 2Make a class called Student, with the following elds& methods: age of type integer, private name of type String, private id of type integer, private grade of type double, private one constructor that sets age, name, id, and grade setters and getters for all the private elds Make an executable class called Exercise2, with main method De ne an array of three students:“Zhang”, 21 years old, id 13579, grade of 68.5“Wang”, 19 years old, id 13784, grade of 89.2“Chang”, 20 years old, id 24680, grade of 76.7 display which student is oldest display which student is best in school

Exercise 3 (page 1)Create necessary classes to describe this inheritance“Dog”,“Cat” (to be set by children classes) class Animal int age String type Animal() Animal(int age) void setAge(int age) int getAge() int compareTo(Animal o) void talk() class Dog extends Animal Dog() Dog(int age) void talk() class Cat extends Animal Cat() Cat(int age) void talk() Dog says“WUF-WUF” Cat says“MIEW-MIEW”

use“super”

use“super”

Display the type and age of animal

Exercise 3 (page 2)Make an executable class called Exercise3, with main method create 3 objects of type Animal called animal1, animal2, animal3 assign animal1 type Dog, age 3; increment age using set/get; ask to talk assign animal2 type Cat, age 4; decrement age using set/get; ask to talk ask animal3 to talk display true/false for: 1) animal1 of type Animal; 2) animal2 of type Dog display who is oldest, animal1 or animal2

Dog at age 4 says... WUF-WUF! Cat at age 3 says... MIEW-MIEW! unknown type at age 0 says... animal1 of same type as Animal: true animal2 of same type as Dog: false Comparing animal1 and animal2: 1

The End See you next time!见