java输入菱形（用java输出菱形星号）
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本文目录一览：
- 1、怎么用java打印菱形？
- 2、用java编写菱形
- 3、Java用户输入，打印菱形，要求，判断输入是否为整数，提示输入奇数
- 4、java打印字母菱形，怎么打！！！
- 5、Java的题 //提示请输入菱形的行数，菱形行数必须为奇数，如果为偶数重新输入 //上边等腰三角
- 6、java 怎样写出一个菱形程序？空心和实心
怎么用java打印菱形？
java打印菱形方法：
package circulationDemo;
import java.util.Scanner;
public class Test {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.println("请输入要打印的行数：");
int num = input.nextInt();
t1(num);// 正直角
split();
t2(num);// 倒直角
split();
t3(num);// 等腰三角
split();
t4(num);// 等腰倒三角++
split();
t5(num);// 等腰倒三角--
split();
t6(num);// 实心菱形
split();
t7(num);// 空心菱形(1)
split();
t8(num);// 空心菱形(2)
split();
t9(num);// 空心菱形(3)
}
private static void t9(int num) {
for (int k = 1; k = num; k++) {
for (int i = 1; i = (num - k); i++) {
System.out.print(" ");
}
System.out.print("*");
for (int i = 1; i = ((k - 2) * 2 + 1); i++) {
System.out.print(" ");
}
if (k != 1) {
System.out.print("*");
}
System.out.println();
}
for (int k = num-1; k = 1; k--) {
for (int i = 1; i = (num - k); i++) {
System.out.print(" ");
}
System.out.print("*");
for (int i = 1; i = ((k - 2) * 2 + 1); i++) {
System.out.print(" ");
}
if (k != 1) {
System.out.print("*");
}
System.out.println();
}
}
private static void t8(int num) {
// 上半部分
for (int i = 1; i = num; i++) {
// 打印上半部分空格
for (int j = 1; j = num - i; j++) {
System.out.print(" ");
}
// 打印原本实心的*部分
for (int j = 1; j = 2 * i - 1; j++) {
// 仅在一行的开头和末尾打印*
if (j == 1 || j == 2 * i - 1) {
System.out.print("*");
} else {
System.out.print(" ");
}
}
System.out.println();
}
// 下半部分
for (int i = 1; i = num - 1; i++) {
for (int j = 1; j = i; j++) {
System.out.print(" ");
}
for (int j = 1; j = 2 * (num - i - 1) + 1; j++) {
if (j == 1 || j == 2 * (num - i - 1) + 1) {
System.out.print("*");
} else {
System.out.print(" ");
}
}
System.out.println();
}
}
private static void t7(int num) {
// 打印上半部分
for (int i = 1; i = num; i++) {
// 打印空格
for (int j = 1; j = (num - i); j++) {
System.out.print(" ");
}
// 打印*的个数
if (i == 1) {
System.out.print("*");
} else {
System.out.print("*");
// 打印菱形里的空格
for (int j = 1; j = (2 * i - 3); j++) {
System.out.print(" ");
}
System.out.print("*");
}
System.out.println();
}
// 打印下半部分
for (int i = num - 1; i 0; i--) {
// 打印空格
for (int j = 1; j = (num - i); j++) {
System.out.print(" ");
}
// 打印*的个数
if (i == 1) {
System.out.print("*");
} else {
System.out.print("*");
// 打印菱形里的空格
for (int j = 1; j = (2 * i - 3); j++) {
System.out.print(" ");
}
System.out.print("*");
}
System.out.println();
}
}
private static void t6(int num) {
// 上半部分
for (int i = 1; i = num; i++) {
for (int j = 1; j = num - i; j++) {
System.out.print(" ");
}
for (int j = 1; j = 2 * i - 1; j++) {
System.out.print("*");
}
System.out.println();
}
// 下半部分
for (int i = 1; i = num - 1; i++) {
for (int j = 1; j = i; j++) {
System.out.print(" ");
}
for (int j = 1; j = 2 * (num - 1 - i) + 1; j++) {
System.out.print("*");
}
System.out.println();
}
}
private static void t5(int num) {
for (int i = num; i 0; i--) {
for (int j = 1; j = num - i; j++) {
System.out.print(" ");
}
for (int j = 1; j = 2 * i - 1; j++) {
System.out.print("*");
}
System.out.println();
}
回答于 2022-12-14
用java编写菱形
for(i=1;i=4;i++)
{
这个小的for是打印每一行前边的空格
for(j=1;j=4-i;j++)
System.out.print(" ");
这个是打印星星的
for(j=1;j=2*i-1;j++)
System.out.print("*");
这个是打印完一行的换行
System.out.println("");
}
下边的是一样的 只不过每一行的空格和星星数 和上边是翻过来的
for(i=1;i=3;i++)
{
for(j=1;j=i;j++)
System.out.print(" ");
for(j=1;j=7-2*i;j++)
System.out.print("*");
System.out.println("");
}
java.sql.SQLException: 无效的列索引
无效的列索引
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:111)
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:145)
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:207)
atoracle.jdbc.driver.OraclePreparedStatement.setStringInternal(OraclePreparedStatement.java:5328)
atoracle.jdbc.driver.OraclePreparedStatement.setString(OraclePreparedStatement.java:5320)
at untitled5.addreader1.validID(addreader1.java:128)
at untitled5.addreader1.jButton1_actionPerformed(addreader1.java:97)
at untitled5.addreader1_jButton1_actionAdapter.actionPerformed(addreader1.java:175)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
代码：String driverName = "oracle.jdbc.OracleDriver";
Driver driver = (Driver) Class.forName(driverName).newInstance();
//连接数据库
Connection con = DriverManager.getConnection(
"jdbc:oracle:thin:@LONG:1521:orcl", "sysman", "tongfang");
PreparedStatement pstmt = con.prepareStatement(
" insert into reader values(?)");
pstmt.setString(1, str1);
pstmt.setString(2,str2);
pstmt.setString(3,str3);
pstmt.setString(4,str4);
ResultSet res = pstmt.executeQuery();
Java用户输入，打印菱形，要求，判断输入是否为整数，提示输入奇数
这个不知为何要求要行数，行数应该是计算出来的呀，您看看我这个，只要求输入奇数
public class LingXing {
public static void main(String[] args) {
int num = 0;
while(num%2==0) {
System.out.println("请输入奇数:");
Scanner s = new Scanner(System.in);
String str = s.next();
if (str.matches("^[0-9]*$")) {
num = Integer.parseInt(str);
}
}
for (int i = 1; i=num;i=i+2){
int spaceNum = (num-i)1;
print(spaceNum," ", false);
print(i,"*", true);
}
for (int i = num-2; i=1;i=i-2){
int spaceNum = (num-i)1;
print(spaceNum," ", false);
print(i,"*", true);
}
}
public static void print(int count, String info, boolean endBreak){
while(count--0){
System.out.print(info);
}
if (endBreak)
System.out.println();
}
}
java打印字母菱形，怎么打！！！
最简单的就是直接在程序中输入这个图形。还有可以使用循环。第一行前面空n个空格，第二行空n-1个空格。当空格为0时然后重新开始循环增加空格，到再空n个空格之后，就不循环了。而字母的话根据中间对称。而从中间到行首，一共有n+1个空格。然后将ABCD的字符通过char字符转化为数字，然后就可以循环了
Java的题 //提示请输入菱形的行数，菱形行数必须为奇数，如果为偶数重新输入 //上边等腰三角
import java.util.*;
class Tester{
private static void print(int n){
// *
// ***
//*****
// ***
// *
for(int row = 0; row n; row++){
// 0 1 2 3 4
// 2 1 0 1 2
int tmp = row n / 2 ? 2 - row : row - 2;
for(int j = 0; j tmp; j++){
System.out.print(" ");
}
// 0 1 2 3 4
// 1 3 5 3 1
tmp = row n/2?2*row+1:-2*row+9;
for(int j=0;jtmp;j++){
System.out.print("*");
}
System.out.println();
}
}
public static void main(String[] args){
Scanner sc = new Scanner(System.in);
while(true){
System.out.print("请输入菱形的行数：");
int n = -1;
try{
n = Integer.parseInt(sc.nextLine().trim());
if(n % 2 != 0){
System.out.print("菱形行数必须为奇数，");
continue;
}
}catch(Exception e){
System.out.print("输入错误，程序退出");
sc.close();
break;
}
print(n);
}
}
}
java 怎样写出一个菱形程序？空心和实心
java打印菱形通过二维数组来打印，实例如下：
int hangshu = 11;
int yiban = hangshu / 2 + 1;
int yibanduo = hangshu / 2;
System.out.println("空心菱形：");
for(int k = 1;k = yiban;k++){
for(int i = 1;i = (yiban - k);i++){
System.out.print(" ");
}
System.out.print("*");
for(int i = 1;i = ( (k - 2) * 2 + 1);i++){
System.out.print(" ");
}
if(k != 1){
System.out.print("*");
}
System.out.println();
}
for(int k = yibanduo;k =1;k--){
for(int i = 1;i = (yiban - k);i++){
System.out.print(" ");
}
System.out.print("*");
for(int i = 1;i = ( (k - 2) * 2 + 1);i++){
System.out.print(" ");
}
if(k != 1){
System.out.print("*");
}
System.out.println();
}
System.out.println("实心菱形：");
for(int i = 1;i = hangshu;i++){
if(i = hangshu/2 + 1){
for(int k = 1;k = hangshu/2 + 1- i;k++){
System.out.print(" ");
}
for(int k = 1;k = i;k++){
System.out.print("* ");
}
System.out.println();
}else{
for(int k =1;k = (i -(hangshu/2 + 1));k++){
System.out.print(" ");
}
for(int k = 1;k = (2 *(hangshu/2 + 1) - i);k++){
System.out.print("* ");
}
System.out.println();
}
}
结果如下：
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