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1. 運行時輸入一個數(shù)n， 求1+2!+3!+…+n!的和；

public static void main(String[] args) {Scanner scan = new Scanner(System.in);int n = scan.nextInt();int add = facadd(n);System.out.println(add);}public static int facadd(int n) {int sum = 0;for (int i = 1; i <= n; i++) {int ret = 1;for (int j = 1; j <= i; j++) {ret *= j;}sum += ret;}return sum;}

2. 使用for循環(huán)打印九九乘法表；

public static void main(String[] args) {for (int i = 1; i <= 9; i++) { for (int j = 1; j <= i; j++) {int sum = i * j;System.out.print(j + "*" + i + "=" + sum + "" + "\t");}System.out.println();} }

3. 編寫一個應用程序求100以內(nèi)的全部素數(shù)；

public static void main(String args[]) {int i, j;for (i = 2; i <= 100; i++) {for (j = 2; j <= i / 2; j++) {if (i % j == 0)break;}if (j > i / 2) {System.out.println("" + i + "是素數(shù)");}}}

4. 請實現(xiàn)對一整型數(shù)序列的排序操作算法（冒泡）；

public static int[] bubbleSort(int[] array) {if (array.length == 0)return array;for (int i = 0; i < array.length; i++)for (int j = 0; j < array.length - 1 - i; j++)if (array[j + 1] < array[j]) {int temp = array[j + 1];array[j + 1] = array[j];array[j] = temp;}return array;} }

5. 使用面向?qū)ο笏枷刖帉懖聰?shù)字游戲：

一個類A有一個成員變量v，設置一個隨機初值。
定義一個類，對A類的成員變量v進行猜。
如果大了則提示大了，小了則提示小了。等于則提示猜測成功。

public class TestE {class A {int v = (int) (Math.random() * 10);public int getV() {return v;}public void setV(int v) {this.v = v;}}class B {int c = (int) (Math.random() * 10);A a = new TestE().new A();void guss() {if (c > a.getV()) {System.out.println("猜大了");} else if (c == a.getV()) {System.out.println("成功");} else {System.out.println("猜小了");}}}public static void main(String[] args) {B b = new TestE().new B();b.guss();} }

6. 已知貓類和狗類：

屬性:毛的顏色,腿的個數(shù)
行為:吃飯
貓?zhí)赜行袨?抓老鼠catchMouse
狗特有行為:看家lookHome
利用面向?qū)ο罄^承法來做

package four;public class Animal {String color;int leg;public String getColor() {return color;}public void setColor(String color) {this.color = color;}public int getLeg() {return leg;}public void setLeg(int leg) {this.leg = leg;}@Overridepublic String toString() {return "Dog [color=" + color + ", leg=" + leg + "]";}void eat() {System.out.println("吃飯");}}

Cat

public class Cat {void catchMouse() {System.out.println("抓老鼠");} }

Dog

public class Dog {void lookHome() {System.out.println("看家");} }

7. 編寫一個程序，用于輸出起始部分如下的Fibonacci數(shù)列1，1，2，3，5，8，13，21，34，55

public class TestF {public static long fibonacci(long number) {if ((number == 0) || (number == 1))return number;elsereturn fibonacci(number - 1) + fibonacci(number - 2);}public static void main(String[] args) {for (int counter = 0; counter <= 10; counter++) {System.out.printf("Fibonacci of %d is: %d\n", counter, fibonacci(counter));}} }

8. 編寫程序輸入5學生的姓名和年齡并打印出來，同時求出平均年齡

Student

package four;public class Student {private String name;private int age;public Student() {}public Student(String name, int age) {this.name = name;this.age = age;}public String getName() {return name;}public void setName(String name) {this.name = name;}public int getAge() {return age;}public void setAge(int age) {this.age = age;}@Overridepublic String toString() {return "Student [name=" + name + ", age=" + age + "]";}}

StudentMain

public class StudentMain {public static void main(String[] args) {Student[] myStu = new Student[5];for (int i = 0; i < 5; i++) {myStu[i] = new Student();}Scanner sc = new Scanner(System.in);for (int i = 0; i < 5; i++) {System.out.println("請輸入第" + (i + 1) + "個學生的姓名");String s = sc.nextLine();myStu[i].setName(s);}for (int i = 0; i < 5; i++) {System.out.println("請輸入第" + (i + 1) + "個學生的年齡");String s = sc.nextLine();int a = Integer.parseInt(s);myStu[i].setAge(a);}for (int i = 0; i < 5; i++) {System.out.println("第" + (i + 1) + "個學生的姓名是" + myStu[i].getName() + ",年齡是" + myStu[i].getAge());System.out.println("平均年齡" + (myStu[0].getAge() + myStu[1].getAge() + myStu[2].getAge() + myStu[3].getAge()+ myStu[4].getAge()) / 5);}} }

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