代碼如下,Rectangle類在java.lang包下有同名類,如需引包請注意,望采納。
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補(bǔ)充:
Rectangle類
package?com.baidu.question183173554138589044;
public?class?Rectangle?{
private?double?width;
private?double?height;
public?void?setRectangle(int?w,?int?h){
if(w0??h0){
width?=?w;
height?=?h;
}else{
System.out.println("錯(cuò)誤:長寬需要大于0");
}
}
public?double?getArea()?{
return?width*height;
}
}
運(yùn)行主類
package?com.baidu.question183173554138589044;
public?class?Main?{
public?static?void?main(String[]?args)?{
Rectangle?rect?=?new?Rectangle();
rect.setRectangle(5,6);
System.out.println(rect.getArea());
}
}
運(yùn)行代碼
具體的代碼如下:
import java.util.HashMap;
public class SearchDemo {
public HashMapInteger,Integer countMap(char[] arr){
HashMap countMap = new HashMapInteger, Integer();
for (int i = 0; i arr.length; i++) {
if(!countMap.containsKey(arr[i])){
countMap.put(arr[i],1);
}else{
int value = (int)countMap.get(arr[i]) + 1;
countMap.put(arr[i],value);
}
}
return countMap;
}
public static void main(String[] args) {
char[] arr={'A','1','R','!','e','','A','5','A','g','#','D'};
int count = new SearchDemo().countMap(arr).get('A');
System.out.println("其中'A'字符的個(gè)數(shù)是:" + count);
}
}
運(yùn)行結(jié)果
按照題目要求編寫的用javaBean規(guī)范設(shè)計(jì)的學(xué)生類Student的Java程序如下
需要?jiǎng)?chuàng)建user.java.test包,把Student.java文件和Test.java文件放入包中,編譯Student.java文件并且編譯運(yùn)行Test.java文件得到運(yùn)行結(jié)果
Student.java文件代碼如下
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 "學(xué)號:"+no+",姓名:"+name+",成績:"+score;
}
public static double getAvg(Student[] sArray){
double sum=0,avg;
for(int i=0;isArray.length;i++){
sum=sum+sArray[i].getScore();
}
avg=sum/sArray.length;
return avg;
}
}
Test.java文件代碼如下
package user.java.test;
public class Test{
public static void main(String[] args){
Student[] sArray=new Student[5];
sArray[0]=new Student("001","張三",89.5);
sArray[1]=new Student("002","李四",82.5);
sArray[2]=new Student("003","王五",93);
sArray[3]=new Student("004","趙六",73.5);
sArray[4]=new Student("005","孫七",66);
System.out.println("這些學(xué)生的平均分:"+Student.getAvg(sArray));
for(int i=0;isArray.length;i++){
System.out.println(sArray[i].toString());
}
}
}