「菱形abcdejava」菱形的判定

本篇文章给大家谈谈菱形abcdejava，以及菱形的判定对应的知识点，希望对各位有所帮助，不要忘了收藏本站喔。

本文目录一览：

• 1、怎样用JAVA绘制一个菱形图案
• 2、java打印字母菱形，怎么打！！！
• 3、用java编程： 输出一个用ABCDEFGHI组成的空心菱形！ 就像这样： A B B C C D D E E F F G G H H I
• 4、用java编写菱形

怎样用JAVA绘制一个菱形图案

java 输出菱形代码：

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package demo;

public class Demo01 {

public static void main(String[] args) {

int i, j, k;

for (i = 1; i = 5; i++) {

for (j = 1; j = 5 - i; j++)

System.out.print(" ");

for (k = 1; k = 2 * i - 1; k++)

System.out.print("*");

System.out.println("");

}

for (i = 1; i = 4; i++) {

for (j = 1; j = i; j++)

System.out.print(" ");

for (k = 1; k = 9 - 2 * i; k++)

System.out.print("*");

System.out.println("");

}

}

}

绘制算法：

1、分为两部分，上半部分和下半部分

2、输出空格部分换个输出*部分

3、最后一个标签需要换行

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

用java编程： 输出一个用ABCDEFGHI组成的空心菱形！ 就像这样： A B B C C D D E E F F G G H H I

public class baidu {

public static void main(String[] args) {

char ch='A';

for(int a=0;a5;a++){

for(int b=4;ba;b--)

System.out.print(" ");

System.out.print(ch);

for(int c=0;ca*2-1;c++){

System.out.print(" ");

}

if(ch!='A')

System.out.print(ch);

ch++;

System.out.print("\n");

}

for(int a=0;a4;a++){

for(int b=0;b=a;b++)

System.out.print(" ");

System.out.print(ch);

for(int c=5-a*2;c0;c--)

System.out.print(" ");

if(a!=3)

System.out.print(ch);

System.out.print("\n");

ch++;

}

}

}

输出结果：

A

B B

C C

D D

E E

F F

G G

H H

I

成功生成（总时间：0 秒）

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();

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