如何用java編寫用 "*"輸出菱形？

參考下面主要代碼：

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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();

}

}

用java編寫菱形

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

{

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中的for循環(huán)寫出一個菱形 求講解

你好，提問者：

若解決了你的問題請采納，若有疑問請追問，謝謝！

這個菱形應(yīng)該是由四個三角形組成，上面兩個三角下面兩個三角，拼接而成的。下面給你寫了個例子：

public?class?LingXing2?{

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

//菱形

CeSanJiao(6);

}

public?static?void?CeSanJiao(int?number){

//上半截

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

?if(i==1){

?for(int?lage=1;lagenumber;lage++){

?System.out.print("-");

?}

?for?(int?j?=?i;?j0?;?j--)?{//列數(shù)

System.out.print("*");

}

?System.out.println();

?}else{

?//反正三角

? for(int?j=i;j1;j--){

? if(j==i){

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

?System.out.print("-");

?}

? }

? System.out.print("*");

? }

? //正三角

? for?(int?j?=?i;?j0?;?j--)?{//列數(shù)

System.out.print("*");

}

? System.out.println();

?}

}

?//下半截

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

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

?for(int?lage=i;lage(number-i-1);lage--){

?System.out.print("-");

?}

?System.out.println("*");

?}else{

?//反倒三角

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

?if(j==(number-i)){

? for(int?lage=number;lage(number-i);lage--){

?System.out.print("-");

?}

? }

? System.out.print("*");

? }

?//倒三角

?for(int?j?=?1;?j??number?-i;?j++){//列數(shù)

System.out.print("*");

}

?}

System.out.println();

?}

}

}

結(jié)果：

-----*

----***

---*****

--*******

-*********

***********

-*********

--*******

---*****

----***

-----*