用java編寫菱形

for(i=1;i=4;i++)

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{

這個小的for是打印每一行前邊的空格

for(j=1;j=4-i;j++)

System.out.print(" ");

這個是打印星星的

for(j=1;j=2*i-1;j++)

System.out.print("*");

這個是打印完一行的換行

System.out.println("");

}

下邊的是一樣的 ?只不過每一行的空格和星星數(shù) ? 和上邊是翻過來的

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: 無效的列索引

無效的列索引

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)

代碼：String driverName = "oracle.jdbc.OracleDriver";

Driver driver = (Driver) Class.forName(driverName).newInstance();

//連接數(shù)據(jù)庫

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();

怎么用java打印菱形？

java打印菱形方法：

package?circulationDemo;

import?java.util.Scanner;

public?class?Test?{

public?static?void?main(String[]?args)?{

Scanner?input?=?new?Scanner(System.in);

System.out.println("請輸入要打印的行數(shù)：");

int?num?=?input.nextInt();

t1(num);//?正直角

split();

t2(num);//?倒直角

split();

t3(num);//?等腰三角

split();

t4(num);//?等腰倒三角++

split();

t5(num);//?等腰倒三角--

split();

t6(num);//?實(shí)心菱形

split();

t7(num);//?空心菱形(1)

split();

t8(num);//?空心菱形(2)

split();

t9(num);//?空心菱形(3)

}

private?static?void?t9(int?num)?{

for?(int?k?=?1;?k?=?num;?k++)?{

for?(int?i?=?1;?i?=?(num?-?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?=?num-1;?k?=?1;?k--)?{

for?(int?i?=?1;?i?=?(num?-?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();

}

}

private?static?void?t8(int?num)?{

//?上半部分

for?(int?i?=?1;?i?=?num;?i++)?{

//?打印上半部分空格

for?(int?j?=?1;?j?=?num?-?i;?j++)?{

System.out.print("?");

}

//?打印原本實(shí)心的*部分

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

//?僅在一行的開頭和末尾打印*

if?(j?==?1?||?j?==?2?*?i?-?1)?{

System.out.print("*");

}?else?{

System.out.print("?");

}

}

System.out.println();

}

//?下半部分

for?(int?i?=?1;?i?=?num?-?1;?i++)?{

for?(int?j?=?1;?j?=?i;?j++)?{

System.out.print("?");

}

for?(int?j?=?1;?j?=?2?*?(num?-?i?-?1)?+?1;?j++)?{

if?(j?==?1?||?j?==?2?*?(num?-?i?-?1)?+?1)?{

System.out.print("*");

}?else?{

System.out.print("?");

}

}

System.out.println();

}

}

private?static?void?t7(int?num)?{

//?打印上半部分

for?(int?i?=?1;?i?=?num;?i++)?{

//?打印空格

for?(int?j?=?1;?j?=?(num?-?i);?j++)?{

System.out.print("?");

}

//?打印*的個數(shù)

if?(i?==?1)?{

System.out.print("*");

}?else?{

System.out.print("*");

//?打印菱形里的空格

for?(int?j?=?1;?j?=?(2?*?i?-?3);?j++)?{

System.out.print("?");

}

System.out.print("*");

}

System.out.println();

}

//?打印下半部分

for?(int?i?=?num?-?1;?i??0;?i--)?{

//?打印空格

for?(int?j?=?1;?j?=?(num?-?i);?j++)?{

System.out.print("?");

}

//?打印*的個數(shù)

if?(i?==?1)?{

System.out.print("*");

}?else?{

System.out.print("*");

//?打印菱形里的空格

for?(int?j?=?1;?j?=?(2?*?i?-?3);?j++)?{

System.out.print("?");

}

System.out.print("*");

}

System.out.println();

}

}

private?static?void?t6(int?num)?{

//?上半部分

for?(int?i?=?1;?i?=?num;?i++)?{

for?(int?j?=?1;?j?=?num?-?i;?j++)?{

System.out.print("?");

}

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

System.out.print("*");

}

System.out.println();

}

//?下半部分

for?(int?i?=?1;?i?=?num?-?1;?i++)?{

for?(int?j?=?1;?j?=?i;?j++)?{

System.out.print("?");

}

for?(int?j?=?1;?j?=?2?*?(num?-?1?-?i)?+?1;?j++)?{

System.out.print("*");

}

System.out.println();

}

}

private?static?void?t5(int?num)?{

for?(int?i?=?num;?i??0;?i--)?{

for?(int?j?=?1;?j?=?num?-?i;?j++)?{

System.out.print("?");

}

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

System.out.print("*");

}

System.out.println();

}

回答于?2022-12-14

如何用java編寫用 "*"輸出菱形？

參考下面主要代碼：

public static void draw()

{

int n=10;

for(int i=1;i=n;i++)//控制行數(shù)

{

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();

}

}