java程序设计教程实验

1、实验一public class Sum10_forpublic static void main(String args)int i=1,n=10,s=0;System.out.print(Sum(+n+)=);for(i=1;in;i+)s+=i;System.out.print(i+);System.out.print(i+=+(s+i);n=10改变n值在“for(i=1;in;i+)“之后加“;”实验二2循环public class Towerpublic static void main(String args)for(int i=0;i4;i+)for(int j=i;j3;j+)

2、System.out.print( );for(int j=1;j0;j-)System.out.print(j);System.out.println(); 递归public class LoopTower public static void pyramid(int i,int n ) if(i=n) return; int num;for(i=1;in+1;i+) num=i;for(int j=0;j1)for(int m=0;mi;m+)num-;for( int m=0;mi;m+) num+;System.out.print(num);for(int m=0;mi-1;m+) n

3、um-;System.out.print(num);elseSystem.out.print(num);System.out.println();pyramid(i,+n); public static void main(String args) pyramid(1,4); 实验二8螺旋public class Luoxuan public static void main(String args) int n=4; /阶数 int mat = new int nn; int i,j,k=0; for (i=0;i(n+1)/2;i+) /i控制生成方阵的圈数，一圈内有4条边 /j控制生成一

4、条边的数据 for (j=i;j=n-i-1;j+) /顶边，从左到右，行不变列变 matij = +k; /k从1递增到n*n for (j=i+1;j=i;j-) /底边，从右到左，行不变列变 matn-i-1j = +k; for (j=n-i-2;j=i+1;j-) /左边，从下到上，行变列不变 matji = +k; for (i=0;imat.length;i+) /输出二维数组 for (j=0;j0) /获得命令行参数 str=args0; System.out.println(str=+str); boolean yes=true; /算法一 int n=str.length

5、(); /获得字符串长度 int i=0; char ch1,ch2; while (yes & (in/2) ) ch1=str.charAt(i); /获得最前的字符 ch2=str.charAt(n-i-1); /获得最后的字符 System.out.println(ch1=+ch1+ ch2=+ch2); if (ch1=ch2) /比较字符 i+; else yes=false; System.out.println(算法一: +yes); String temp=,sub1=; /算法二 for (i=0;in;i+) sub1=str.substring(i,i+1); /取子串

6、 temp=sub1+temp; /连接字符串 System.out.println(temp=+temp); System.out.println(算法二: +str.equals(temp); /比较字符串 实验三4声明point类class Point int x=0; int y=0;public Point(int a,int b) x=a; y=b; public Point(Point p) x=p.x; y=p.y; void set(int a,int b) x=a; y=b;void move(int a,int b) x=x+a; y=y+b;String get() r

7、eturn x:+x+ y:+y;public static void main(String arg) Point p1=new Point(10,20); Point p2=new Point(p1); p2.set(50,60); p1.move(5,8); System.out.println(p1: +p1.get(); System.out.println(p2: +p2.get(); 实验三8为例3.5增加成绩变量public class Student private String sSO;/学号 private String sName;/姓名 private String

8、sSex;/性别 private String sAge;/年龄 private String sJava;/成绩 public String getSSO() return sSO; public void setSSO(String sso) sSO = sso; public String getSName() return sName; public void setSName(String name) sName = name; public String getSSex() return sSex; public void setSSex(String sex) sSex = se

9、x; public String getSAge() return sAge; public void setSAge(String age) sAge = age; public String getSJava() return sJava; public void setSJava(String java) sJava = java; 统计public class textStudent public static void main(String args) Student s1 = new Student();/学生对象一 Student s2 = new Student();/学生对

10、象二 /学生一信息 s1.setSName(Tom); s1.setSSO(1001002); s1.setSAge(18); s1.setSSex(男); s1.setSJava(89); /学生二信息 s2.setSName(Lucy); s2.setSSO(1001001); s2.setSAge(19); s2.setSSex(女); s2.setSJava(90); System.out.println(两名学生的信息如下：); System.out.println(学号t姓名t年龄t性别t成绩); System.out.println(s1.getSSO()+t+s1.getSNa

11、me()+t+s1.getSAge()+t+s1.getSSex()+t+s1.getSJava(); System.out.println(s2.getSSO()+t+s2.getSName()+t+s2.getSAge()+t+s2.getSSex()+t+s2.getSJava(); System.out.println(); int sj1 = Integer.parseInt(s1.getSJava(); int sj2 = Integer.parseInt(s2.getSJava(); double sum = (sj1+sj2)/2.0;/保留一位小数 System.out.pr

12、intln(平均成绩为:+sum); 实验三9public class Group public static void print(Object table) /输出对象数组 if (table!=null) for (int i=0; itable.length; i+) System.out.println(tablei.toString(); /运行时多态 public static int indexOf(Object table, Object obj) /在对象数组中查找给定值 /若查找成功返回元素下标，否则返回-1 if (table!=null & obj!=null) fo

13、r(int i=0; itable.length; i+) if (obj.equals(tablei) return i; return -1; public static Person oldest(Person table) /返回年龄最大者，返回对象 if (table=null) return null; int max=0; for (int i=1; itablemax.getAge() max = i; return tablemax; public static void main(String args) Person table=new Person(李小明, new M

14、yDate(1989,3,15), new Student(胡东东, new MyDate(1990,4,3), 计算机), new Student(张小莉, new MyDate(1991,5,1), 电子信息); print(table); String name=张小莉; int index = indexOf(table, new Person(name); /查找姓名为name的对象 System.out.println(查找+name+结果： +(index!=-1) ? tableindex.toString() : 未找到); System.out.println(年龄最大者是

15、 (+oldest(table).toString()+); Student.howMany();System.out.println(平均年龄是+average(table)+岁); 实验三12声明三角类public abstract class ClosedFigure /闭合图形抽象类 protected String shape; /形状 protected ClosedFigure(String shape) /构造方法，不能是抽象方法 this.shape = shape; protected ClosedFigure() this(未知); public abstract dou

16、ble area(); /计算面积，抽象方法，以分号;结束 public abstract double perimeter(); /计算周长，抽象方法 public void print() /显示形状、属性、周长及面积 System.out.println(一个+this.shape+，+this.toString() +，周长为+this.perimeter()+，面积为+this.area(); 求周长和面积public class Triangle extends ClosedFigureprotected double height;protected double under;protected double length;public Triangle(double height,double under,double length)this.height=height;this.under=under;this.length=length;public String toString()return高+height+ +底+under;public