简单的Java程序

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5.谢谢使用:

代码：package text3;
import java.util.Scanner;
public class Question1 {
public static void main(String[] args) {
show();
oprater();
}

public static void oprater() {
System.out.print("请选择：");
while (true) {
Scanner sc = new Scanner(System.in);
String num = sc.nextLine();
switch (num) {
case "1":
max();
break;
case "2":
min();
break;
case "3":
pow();
break;
case "4":
sqrt();
break;
case "5":
System.out.println("欢迎下次使用！！！！");
System.exit(0);
break;

default:
System.out.println("系统错误！！！");
break;
}
}
}

public static void show() {
System.out.println("--欢迎使用--");
System.out.println("1.求最大值:");
System.out.println("2.求最小值:");
System.out.println("3.求指数值:");
System.out.println("4.求平方根:");
System.out.println("5:退出:");

}

static void max() {
Scanner sc = new Scanner(System.in);
System.out.print("请输入第一个数字：");
double x = sc.nextDouble();
System.out.print("请输入第二个数字：");
double y = sc.nextDouble();
if (x <= y) {
x = y;
}
System.out.println("两个数中最大值为：" + x);
System.out.print("请选择：");
}

static void min() {
Scanner sc = new Scanner(System.in);
System.out.print("请输入第一个数字：");
double x = sc.nextDouble();
System.out.print("请输入第二个数字：");
double y = sc.nextDouble();
if (x > y) {
x = y;
}
System.out.println("两个数中最小值为：" + x);
System.out.print("请选择：");
}

static void pow() {
Scanner sc = new Scanner(System.in);
System.out.print("请输入数字：");
double a = sc.nextDouble();
System.out.print("请输入指数：");
double b = sc.nextDouble();
double result = Math.pow(a, b);
System.out.println(a + "^" + b + "=" + result);
System.out.print("请选择：");
}

static void sqrt() {
Scanner sc = new Scanner(System.in);
System.out.print("请输入一个正数：");
double a = sc.nextDouble();
double result1 = Math.sqrt(a);
double result2 = -Math.sqrt(a);
System.out.println(a + "的平方根是：" + result1 + "和" + result2);
System.out.print("请选择：");
}
}

二：打印图形

1：空心矩形:
**********
* *
* *
* *

**********

代码：static void hollowRectangle() {
for (int i = 0; i < 5; i++) {
for (int j = 0; j < 10; j++) {
if (i == 0 || i == 4 || j == 0 || j == 9) {
System.out.print("*");
} else {
System.out.print(" ");
}
}
System.out.println();
}
}

2：空心上三角(右):
##########
# #
# #
# #
# #
# #
# #
# #
##
#

代码：static void hollowUpTriangleRight(){
for (int i = 1; i <= 10; i++) {
for (int j = 1; j <= 10; j++) {
if(i==1||j==10||i==j){
System.out.print("#");
}else {
System.out.print(" ");
}
}
System.out.println();
}

}

3：空心上三角(左):

##########
# #
# #
# #
# #
# #
# #
# #
##
#

代码：static void hollowUpTriangleLeft(){
for (int i = 0; i < 10; i++) {

for (int j = 0; j <10; j++) {
if(i==0||j==0||i+j==9){
System.out.print("#");
}else {
System.out.print(" ");
}
}
System.out.println();
}
}

4：实心上三角(右):
##########
#########
########
#######
######
#####
####
###
##
#

代码：static void filledUpTriangleRight(){
for (int i = 1; i <= 10; i++) {
for (int j = 1; j<=10 ; j++) {
if(i>j){
System.out.print(" ");
}else {
System.out.print("#");
}
}
System.out.println();
}

}

5：实心上三角(左):
##########
#########
########
#######
######
#####
####
###
##
#

代码：static void filledUpTriangleLeft(){
for (int i = 1; i <= 10; i++) {
for (int j = 1; j<=10 ; j++) {
if(j>=i){
System.out.print("#");
}
}
System.out.println();
}
}

6：空心下三角(左):
#
##
# #
# #
# #
# #
# #
# #
# #
##########

代码：static void hollowBelowTriangleLeft(){
for (int i = 1; i <= 10; i++) {
for (int j = 1; j<=10 ; j++) {
if(i==10||j==1||i==j){
System.out.print("#");
}else {
System.out.print(" ");
}
}
System.out.println();
}
}

7：空心下三角(右):
#
# #
# #
# #
# #
# #
# #
# #

# #

# # # # #### # #

代码：static void hollowBelowTriangleRight(){
for (int i = 1; i <= 10; i++) {
for (int j = 1; j<=10 ; j++) {
if(i==10||j==10||i+j==11){
System.out.print("#");
}else {
System.out.print(" ");
}
}
System.out.println();
}
}

8：

#
##
###
####
#####
######
#######
########
#########
##########

代码：

static void filledBelowTriangleLeft(){
for (int i = 1; i <= 10; i++) {
for (int j = 1; j<=10 ; j++) {
if(j<=i){
System.out.print("#");
}
}
System.out.println();
}
}

9：实心下三角 (右):
#
##
###
####
#####
######
#######
########
#########
##########

代码：static void filledBelowTriangleRight(){
for (int i = 1; i <= 10; i++) {
for (int j =1; j<=10 ; j++) {
if(i+j>=11){
System.out.print("#");
}
else {
System.out.print(" ");
}
}
System.out.println();
}
}

10：空心菱形:
#
# #
# #
# #
# #
# #
# #
# #
# #
# #
# #
# #
# #
# #
# #
# #
# #
# #
# #
# #
#

代码：

static void hollowRhombus(){
for (int i = 1; i <= 21; i++) {
for (int j =1; j<=21 ; j++) {
if(i+j==12||i==j+10||j==i+10||i+j==32){
System.out.print("#");
}else {
System.out.print(" ");
}
}
System.out.println();
}

}

11 实心菱形: #
###
#####
#######
#########
###########
#############
###############
   #################
###################
#####################
  ###################
#################
###############
#############
###########
#########
#######
#####
###
#

代码： static void filledRhombus(){
for (int i = 1; i <= 21; i++) {
for (int j =1; j<=21 ; j++) {
if(i+j>=12&&i<=j+10&&j<=i+10&&i+j<=32){
System.out.print("#");
}else {
System.out.print(" ");
}

}
System.out.println();
}
}

三、输入两个整数,返回这两个数的最大公约数和最小公倍数

package text3;
import java.util.Scanner;
public class MinMaxData {

public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
System.out.print("请输入第一个整数：");
double x = sc.nextDouble();
System.out.print("请输入第二个整数：");
double y = sc.nextDouble();
highestCommonDivissor( x,y);
System.out.println(x+","+y+"的最大公約数是："+highestCommonDivissor( x,y));
lowestCommonMultiple( x, y);

}
static double highestCommonDivissor(double x,double y){
double z=x%y;
//余数不为0，继续相除，直到余数为0
while(z!=0) {
x=y;
y=z;
z=x%y;
}
return y;
}//最小公倍數：x*y/他們的最大公約數
static void lowestCommonMultiple(double x,double y){

double result=(x*y)/MinMaxData.highestCommonDivissor(x, y);
System.out.println(x+","+y+"的最小公倍数是："+result);

}

}

四：求1！+2！+……+10！的和。

代码：package text3;

public class Factorial {

public static void main(String[] args) {
muliple();
}
static void muliple(){
int a=1;
long sum=0L;
for(int i=1;i<=10;i++){
a*=i;
sum=sum+a;
}
System.out.println("1!+2!+3!+4+5!+6!+7!+8!+9!+10!="+sum);
}

}

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