java画棱形源代码,java画出菱形

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: 如何用JAVA画一个菱形

public class PrintDiamond2{

   public static void main (String args[]){

      int TotalLayer=9; 

      for(int layer=1; layer=TotalLayer; layer++) {

         for(int space=1; space=Math.abs((TotalLayer+1)/2-layer); space++){

            System.out.print(" ");

         }

         for(int b=1; b=TotalLayer-2*Math.abs((TotalLayer+1)/2-layer); b++){

            System.out.print("*");

         }

         System.out.println();

      }

   }

}

用3个for循环打出菱形，可以改变TotalLayer的值来改变菱形的大小

第一个for循环规定多少行

第二个for循环规定每行有多少个空格

第三个for循环规定每行有多少个星号

然后换行，重复2,3循环直到完成第一个循环

最后菱形完成

Q4: 如何用java编写用 "*"输出菱形

可选中1个或多个下面的关键词，搜索相关资料。也可直接点“搜索资料”搜索整个问题。

java

用 "*"输出菱形

Q5: 用JAVA写出一个菱形 请接着我下面的写 只能用我的方法，已经写出一半了，要求每行写上注释

import java.util.Scanner;

public class Print{

/**

* @param args

*/

public static void main(String[] args) {

Scanner sin = new Scanner(System.in);

System.out.println("请输入菱形的最多#数：");

int l = sin.nextInt();

if(l%2==0) {

System.out.println("由于输入的是个偶数，现在已+1转换成奇数！");

l=l+1;

}

for(int i=1;i=l;i++) {

if(i%2==1) {

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

System.out.print(" ");

}

for(int k=1;k=i;k++) {

System.out.print("#");

}

}

else {

System.out.println();

}

}

System.out.println();

for(int i=l;i=1;i--) {

if(i%2==1) {

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

System.out.print(" ");

}

for(int k=1;k=i;k++) {

System.out.print("#");

}

}

else {

System.out.println();

}

}

}

}

下面的很好写,就是把前面for循环条件里面反过来就是了.把++的换成--