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java打出菱形代码 java编程输出菱形图案

IT技术怀念

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(" ");
}
for(int j=1;j=2*i-1;j++)//打印*
{
System.out.print("*");
}
System.out.println();
}
for(int i=n-1;i=1;i--)
{
for(int k=i;k=n-1;k++)
{
System.out.print(" ");
}
for(int j=1;j=2*i-1;j++)
{
System.out.print("*");
}
System.out.println();
}
}
Java打印菱形高效简洁代码public class shu{
public static void main(String[] a){
for(int i=0;i6;i++){
for(int j=6-i;j0;j--){
System.out.print(" ");
}
for(int k=1;k=2*i+1;k++){
System.out.print("*");
}
System.out.println();
}
/*以上是打印了一个上等腰三角形*/
for(int i=6;i=0;i--){
for(int j=6-i;j0;j--){
System.out.print(" ");
}
for(int k=1;k=2*i+1;k++){
System.out.print("*");
}
System.out.println();
}
}
}
只要把for的数据换下下等腰三角形就出来了，所以原理其实就是打印2个等腰三角形
用java编写菱形for(i=1;i=4;i++)
{
这个小java打出菱形代码的for是打印每一行前边java打出菱形代码的空格
for(j=1;j=4-i;j++)
System.out.print(" ");
这个是打印星星java打出菱形代码的
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)

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