用java编写菱形

for(i=1i<=4i++)

{

这个小的for是打印每一行前边的空格

for(j=1j<=4-ij++)

System.out.print(" ")

这个是打印星星的

for(j=1j<=2*i-1j++)

System.out.print("*"碧数)

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悔纤首和星星数   和上边竖则是翻过来的

for(i=1i<=3i++)

{

for(j=1j<=ij++)

System.out.print(" ")

for(j=1j<=7-2*ij++)

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()

public class Diamond1 {

public static void main(String[] args) {

// TODO 自动生成的方法存根

String m=" "

for(int a=0a<4a++){//控制行数，为后面的公式定基数

for(int b=4-ab>=0b--){

System.out.print(m)//输出*之前的空格

}for(int c=2*a-1c>-2c--){

System.out.print("*")//输出对应洞瞎行数的*数目

}System.out.println()/纳衫空/换行

}//菱形上半部分

for(int A=4A<7A++){//控制行数，为后面的公式定基数

for(int B=A-3B>=-1B--){

System.out.print(m)//输出*之前的空格

}for(int C=13-2*AC>0C--){

System.out.print("*"塌槐)//输出对应行数的*数目

}System.out.println()//换行

}//菱形下半部分

}

}

手打~~

public class Var_02 {

public static void main(String args[])

{

//进入循环体

/*

*第一次，当i=1的时候 ，进入，

*

*/

for (int i = 1i <= 7i += 2)

{

/*

* 这个for循环是打的空白。就是说。当第一行打一个星之前的时候

*

* 这里首先要先开始打七个空白处

*

* 然后由于星星每下一行要多打，所以第二搭橘喊个for里面就要递增的方式

*

* 星星越来越多。相对的空白就越来越少了。

*

*/

for (int kong = 7kong >i - 1kong--)

{

System.out.print(" ")

}

for (int xing = 1xing <= ixing++)

{

System.out.print("* ")

}

System.out.println()

}

/*

*

* 底下的这个循环到底和上面的相反的。

*

* 是先空白打的少。然后星星就打的多。

*/

for (int j = 1j <= 5j += 2)

{

for (int kong1 = 1kong1 <j + 3kong1++)

{

System.out.print(" ")

}

for (int xing1 = 5xing1 >= jxing1--)

{

System.out.print("* ")

}

System.out.println()

}

}

}其实这个菱形就是两个三角形知野在一起伍袭。上面是个正三角形，先打空白出来。依次减少空白。星星相反的慢慢增多而下面的是倒三角形。也是先打空白。依次增多空白。星星也相反的慢慢减少

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