java练习题求完整代码

按照题目要求编写的用javaBean规范设计的学生类Student的Java程序如下

需要创建user.java.test包,把Student.java文件和Test.java文件放入包中,编译Student.java文件并且编译运行Test.java文件得到运行结果

Student.java文件代码如下

package user.java.test

import java.io.Serializable

public class Student implements Serializable{

private static final long serialVersionUID = 1L

private String no

private String name

private double score

public Student(){}

public Student(String no,String name,double score){

this.no=no

this.name=name

this.score=score

}

public String getNo(){ return no}

public void setNo(String no){ this.no=no}

public String getName(){ return name}

public void setName(String name){ this.name=name}

public double getScore(){ return score}

public void setScore(double score){ this.score=score}

public String toString(){

return "学号:"+no+",姓名:"+name+",成绩:"+score

}

public static double getAvg(Student[] sArray){

double sum=0,avg

for(int i=0i<sArray.lengthi++){

sum=sum+sArray[i].getScore()

}

avg=sum/sArray.length

return avg

}

}

Test.java文件代码如下

package user.java.test

public class Test{

public static void main(String[] args){

Student[] sArray=new Student[5]

sArray[0]=new Student("001","张三",89.5)

sArray[1]=new Student("002","李四",82.5)

sArray[2]=new Student("003","王五",93)

sArray[3]=new Student("004","赵六",73.5)

sArray[4]=new Student("005","孙七",66)

System.out.println("这些学生的平均分:"+Student.getAvg(sArray))

for(int i=0i<sArray.lengthi++){

System.out.println(sArray[i].toString())

}

}

}

按照你的要求编写的Java程序如下

import java.util.Scanner

public class S{

public static void main(String[] args){

int n=5

int[] a=new int[n]

System.out.print("请输入"+n+"个正整数:")

Scanner sc=new Scanner(System.in)

for(int i=0i<ni++){

a[i]=sc.nextInt()

}

System.out.print("其中的偶数为:")

for(int i=0i<ni++){

if(a[i]%2==0){

  System.out.print(a[i]+" ")

}

}

}

}

public class Demo3 {

public static void main(String[] args) {

byte a =1

short b=1

int c = 1

long d = 1l

float e=1f

double f =1

char g ='1'

boolean h = true

System.out.println("byte a ="+a)

System.out.println("short b="+b)

System.out.println("int c ="+c)

System.out.println("long d ="+d)

System.out.println("float e="+e)

System.out.println("double f ="+f)

System.out.println("char g ="+g)

System.out.println("boolean h ="+h)

int x=a%b

long y = c+d

boolean z=(b==c)

System.out.println("int x="+x)

System.out.println("long y"+y)

System.out.println("boolean z"+z)

}

}

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