菱形JAVA语言代码

如何用java编写用 "*"输出菱形?

参考下面主要代码：

public static void draw()

{

int n=10;

for(int i=1;i=n;i◆◆)//控制行数

for(int k=n-1;k=i;k--)//打印空格

System.out.print(" ");

}

System.out.print("*");

System.out.println();

for(int i=n-1;i=1;i--)

for(int k=i;k=n-1;k◆◆)

用java编写菱形

这个小的for是打印每一行前边的空格

这个是打印星星的

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(j=1;j=i;j◆◆)

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 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.Window.dispatchEventImpl(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.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(

PreparedStatement pstmt = con.prepareStatement(

" insert into reader values(?)");

pstmt.setString(1, str1);

ResultSet res = pstmt.executeQuery();

用java打印菱形.

第二段：一个三角形的实现思路：以输出一个空心三角形为例：

第三段：菱形分实心和空心两种,其代码及解析分别如下：

（一）实心菱形.

①.、函数代码：

(二)空心菱形：

①.、函数代码如下：

扩展资料：

java打印的输出方式解析：

①.、print()：print就是一般的标准输出,但是不换行.

要分辨清楚System.out.print()和System.out.println()的区别.System.out.print()是单纯的输出,而System.out.println()的功能是输出内容后换行,到达下一行,在使用时要注意区分两者之间的不同.

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