用java編寫菱形

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

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{

這個小的for是打印每一行前邊的空格

for(j=1;j=4-i;j++)

System.out.print(" ");

這個是打印星星的

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

System.out.print("*");

這個是打印完一行的換行

System.out.println("");

}

下邊的是一樣的 ?只不過每一行的空格和星星數(shù) ? 和上邊是翻過來的

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: 無效的列索引

無效的列索引

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)

代碼：String driverName = "oracle.jdbc.OracleDriver";

Driver driver = (Driver) Class.forName(driverName).newInstance();

//連接數(shù)據(jù)庫

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();

如何用java編寫用 "*"輸出菱形？

參考下面主要代碼：\x0d\x0apublicstaticvoiddraw()\x0d\x0a{\x0d\x0aintn=10;\x0d\x0afor(inti=1;i=i;k--)//打印空格\x0d\x0a{\x0d\x0aSystem.out.print("");\x0d\x0a}\x0d\x0afor(intj=1;j=1;i--)\x0d\x0a\x0d\x0a{\x0d\x0afor(intk=i;k

回答于?2022-12-14

用Java編菱形圖案1357531 * *** *****

代碼如下：

/**

*

*/

package main;

/**

* @author GT

*

*/

public class Mains {

/**

*

*/

public Mains() {

// TODO Auto-generated constructor stub

}

public static void print(int size) {

if (size % 2 == 0) {

size++; // 計算菱形大小

}

for (int i = 0; i size / 2 + 1; i++) {

for (int j = size / 2 + 1; j i + 1; j--) {

System.out.print(" "); // 輸出左上角位置的空白

}

for (int j = 0; j 2 * i + 1; j++) {

System.out.print("*"); // 輸出菱形上半部邊緣

}

System.out.println(); // 換行

}

for (int i = size / 2 + 1; i size; i++) {

for (int j = 0; j i - size / 2; j++) {

System.out.print(" "); // 輸出菱形左下角空白

}

for (int j = 0; j 2 * size - 1 - 2 * i; j++) {

System.out.print("*"); // 輸出菱形下半部邊緣

}

System.out.println(); // 換行

}

}

/**

* @param args

*/

public static void main(String[] args) {

// TODO Auto-generated method stub

print(11);

}

}