java输出菱形源代码 java输出一个菱形图案

java 怎样写出一个菱形程序？空心和实心

java打印菱形通过二维数组来打印，实例如下：

int hangshu = 11;

int yiban = hangshu / 2 + 1;

int yibanduo = hangshu / 2;

System.out.println("空心菱形：");

for(int k = 1;k = yiban;k++){

for(int i = 1;i = (yiban - k);i++){

System.out.print(" ");

}

System.out.print("*");

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

System.out.print(" ");

}

if(k != 1){

System.out.print("*");

}

System.out.println();

}

for(int k = yibanduo;k =1;k--){

for(int i = 1;i = (yiban - k);i++){

System.out.print(" ");

}

System.out.print("*");

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

System.out.print(" ");

}

if(k != 1){

System.out.print("*");

}

System.out.println();

}

System.out.println("实心菱形：");

for(int i = 1;i = hangshu;i++){

if(i = hangshu/2 + 1){

for(int k = 1;k = hangshu/2 + 1- i;k++){

System.out.print(" ");

}

for(int k = 1;k = i;k++){

System.out.print("* ");

}

System.out.println();

}else{

for(int k =1;k = (i -(hangshu/2 + 1));k++){

System.out.print(" ");

}

for(int k = 1;k = (2 *(hangshu/2 + 1) - i);k++){

System.out.print("* ");

}

System.out.println();

}

}

结果如下：

相关问答

Q1: 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();

Q2: 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();

}

}

Q3: 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

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