java不空心菱形代碼 java實(shí)心菱形代碼

Java打印菱形高效簡(jiǎn)潔代碼

public?class?shu{

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

for(int?i=0;i6;i++){

for(int?j=6-i;j0;j--){

System.out.print("?");

}

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

System.out.print("*");

}

System.out.println();

}?

/*以上是打印了一個(gè)上等腰三角形*/

for(int?i=6;i=0;i--){

for(int?j=6-i;j0;j--){

System.out.print("?");

}

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

System.out.print("*");

}

System.out.println();

}

}

}

只要把for的數(shù)據(jù)換下??下等腰三角形就出來(lái)了，所以原理其實(shí)就是打印2個(gè)等腰三角形

用java編寫(xiě)菱形

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

{

這個(gè)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(gè)是打印星星的

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

System.out.print("*");

這個(gè)是打印完一行的換行

System.out.println("");

}

下邊的是一樣的 ?只不過(guò)每一行的空格和星星數(shù) ? 和上邊是翻過(guò)來(lái)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(wú)效的列索引

無(wú)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(kù)

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();

如何用Java通過(guò)#號(hào)打出囧字、菱形和空心菱形？

顯示效果是這樣的：

代碼如下：

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("實(shí)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();

}????

}

囧字再看看

高手指點(diǎn)一下，JAVA代碼怎么打不出菱形出來(lái)去，新手請(qǐng)教

已修改，復(fù)制粘貼即可

public?class?Diamond

{

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

{

printHollowRhombus?(10);

}

public?static?void?printHollowRhombus?(?int?size?)

{

if?(size?%?2?==?0)

{

size++;//?計(jì)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?("?");//?輸出左上角位置的空白

}

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

{

if?(j?==?0?||?j?==?2?*?i)

{

System.out.print?("*");//?輸出菱形上半部邊緣

}

else

{

System.out.print?("?");//?輸出菱形上半部空心

}

}

System.out.println?();

}

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

{

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

{

System.out.print?("?");//?輸出菱形左下角空白

}

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

{

if?(j?==?0?||?j?==?2?*?(?size?-?i?-?1?))

{

System.out.print?("*");//?輸出菱形下半部邊緣

}

else

{

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

}

}

System.out.println?();

}

}

}

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