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java图形菱形完整代码 菱形用java代码怎么搞
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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();
相关问答
Q1: 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：
Q2: 用Java编写打印一段图形(类似菱形)的程序
这个题目主要又两个难点：1.$符号不是一直增加，而是先增加，后减少。2需要在$前补空格。
代码如下：
public class PrintDollar {
public static void main(String[] args) {
// 总行数，可以修改
int row = 5;
// 每一行的$符号数量
int dollarNumber;
// 追加的空格数量
int spaceNumber;
String dollar = "$";
for (int i = 1; i = row; i++) {
// 每一行输出的字符
String printString = "";
/*
* 判断行数是否超过了一半，超过一半$符号开始减少
*/
if (i * 2 - 1 row) {
// 行数超过一半的情况
dollarNumber = (row - i) * 2 + 1;
spaceNumber = (row - dollarNumber) / 2;
} else {
// 行数没超过一半的情况
dollarNumber = i * 2 - 1;
spaceNumber = (row - dollarNumber) / 2;
}
//追加空格
for (int j = 0; j spaceNumber; j++) {
printString += " ";
}
//追加$符号
for (int j = 0; j dollarNumber; j++) {
printString += dollar;
}
System.out.println(printString);
}
}
}
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: 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);
}
}
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