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1、编程练习题1 给出一百分制成绩，要求输出成绩等级A，B，C，D，E。90分以上的为A，8089分为B，7079分为C，6069为D，60分以下为E。（1）源程序：public class TestScore public static void main(String args)int score;int sc= 95,83,70,62,50;for(int i=0;i=4;i+)score=sci;switch(score/10)case 10:;case 9: System.out.println(score +score+ is A); break;case 8: System.out.
2、println(score +score+ is B); break;case 7: System.out.println(score +score+ is C); break;case 6: System.out.println(score +score+ is D); break;default: System.out.println(score +score+ is E); break;(2) 运行结果：2 编程实现对数组元素由大到小排列。（1）源程序：public class ArraySort public static void main(String args) int as=1
3、2,2,45,19,78,15,23,-10,9,-40;for(int i=1;i=9;i+)for(int j=0;j=9-i;j+)int t;if(asjasj+1)t=asj;asj=asj+1;asj+1=t;for(int i=0;i=9;i+)System.out.print( +asi+ );（2）运行结果：3 打印出所有的“水仙花数”。所谓“水仙花数”是指一个三位数，其各位数字的立方和等于该数本身。例如：153是一个“水仙花数”，因为153=13+53+33。（1）源程序：public class FlowerNumber public static void main(S
4、tring args) for(int i=100;i0)System.out.print(num.real+num.imag+i);else if(num.imag 0)System.out.print(num.real+num.imag+i);elseSystem.out.print(num.real);public void add(Complex num1,Complex num2)Complex num3=new Complex(0,0);num3.imag=num1.imag+num2.imag;num3.real=num1.real+num2.real;System.out.pr
5、int();outcomplex(num1);System.out.print()+();outcomplex(num2);System.out.print()=);outcomplex(num3);System.out.println();public void less(Complex num1,Complex num2)Complex num3=new Complex(0,0);num3.imag=num1.imag-num2.imag;num3.real=num1.real-num2.real;System.out.print();outcomplex(num1);System.out
6、.print()-();outcomplex(num2);System.out.print()=);outcomplex(num3);System.out.println();public void mult(Complex num1,Complex num2)Complex num3=new Complex(0,0);num3.imag=num1.imag*num2.real+num1.real*num2.imag;num3.real=num1.real*num2.real-num1.imag*num2.imag;System.out.print();outcomplex(num1);Sys
7、tem.out.print()*();outcomplex(num2);System.out.print()=);outcomplex(num3);System.out.println();public class ComplexOperation public static void main(String args) / TODO Auto-generated method stubComplex com1=new Complex(2,-4);System.out.print(The first complex is:);com1.outcomplex(com1);System.out.p
8、rintln();Complex com2=new Complex(15,4);System.out.print(The second complex is:);com1.outcomplex(com2);System.out.println();com1.add(com1,com2);com1.less(com1,com2);com1.mult(com1,com2);（2）运行结果：5编程创建一个Box类，在其中定义三个变量表示一个立方体的长、宽和高，定义一个构造方法对这三个变量进行初始化，然后定义一个方法求立方体的体积。创建一个对象，求给定尺寸的立方体的体积。（1）源程序：class Bo
9、xprivate float length,width,heigth;public Box(float l,float w,float h)this.length=l;this.width=w;this.heigth=h;public float boxVolume()return this.length*this.width*this.heigth;public class BoxTest public static void main(String args) / TODO Auto-generated method stubBox box1=new Box(4,5,6);System.o
10、ut.println(This boxs volume is:+box1.boxVolume();（2）运行结果：6定义一个学生类（Student），属性包括：学号，班号，姓名，性别，年龄，班级总人数；方法包括：获得学号，获得班号，获得姓名，获得性别，获得年龄，获得班级总人数，修改学号，修改班号，修改姓名，修改性别，修改年龄以及一个toString()方法将Student类中的所有属性组合成一个字符串。定义一个学生数组对象。设计程序进行测试。（1）源程序：class Studentprivate String name,number,classnum,sex;private int age;p
11、rivate static int allnum=0;public Student(String na,String num,String cla,String se,int ag)name=na;number=num;classnum=cla;sex=se;age=ag;allnum+;public String getName()return name;public String getNumber()return number;public String getClassNumber()return classnum;public String getSex()return sex;pu
12、blic int getAge()return age;public int getAllNumber()return allnum;public String toString()return name+number+classnum+sex+age+allnum;public class StudentTest public static void main(String args) Student stu=new Student5; stu0=new Student(周,08201220,082012,boy,21);stu1=new Student(扈,08201221,082012,boy,21);stu2=new Student(张,08201222,082012,boy,19);stu3=new Student(李,
