请问怎么用 java 画菱形~~~~~~?????????

java 输出菱形代码：

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package demo;

public class Demo01 {

public static void main(String[] args) {

int i, j, k;

for (i = 1; i = 5; i++) {

for (j = 1; j = 5 - i; j++)

System.out.print(" ");

for (k = 1; k = 2 * i - 1; k++)

System.out.print("*");

System.out.println("");

}

for (i = 1; i = 4; i++) {

for (j = 1; j = i; j++)

System.out.print(" ");

for (k = 1; k = 9 - 2 * i; k++)

System.out.print("*");

System.out.println("");

}

}

}

绘制算法：

1、分为两部分，上半部分和下半部分

2、输出空格部分换个输出*部分

3、最后一个标签需要换行

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：

用Java编菱形图案1357531 * *** *****

代码如下：

/**

*

*/

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++; // 计算菱形大小

}

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

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

System.out.print(" "); // 输出左上角位置的空白

}

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

System.out.print("*"); // 输出菱形上半部边缘

}

System.out.println(); // 换行

}

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

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

System.out.print(" "); // 输出菱形左下角空白

}

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

System.out.print("*"); // 输出菱形下半部边缘

}

System.out.println(); // 换行

}

}

/**

* @param args

*/

public static void main(String[] args) {

// TODO Auto-generated method stub

print(11);

}

}

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();

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