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如何用JAVA畫一個菱形
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個for循環打出菱形,可以改變TotalLayer的值來改變菱形的大小
第一個for循環規定多少行
第二個for循環規定每行有多少個空格
第三個for循環規定每行有多少個星號
然後換行,重複2,3循環直到完成第一個循環
最後菱形完成
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 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();
//連接數據庫
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();
怎麼用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:”);
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
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
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();
}
}
private static void t4(int num) {
for (int i = 1; i = num; i++) {
for (int j = 1; j = i – 1; j++) {
System.out.print(” “);
}
for (int j = 1; j = 2 * (num – i) + 1; j++) {
System.out.print(“*”);
}
System.out.println();
}
}
private static void t3(int num) {
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();
}
}
private static void split() {
System.out.println(“—————“);
}
private static void t2(int num) {
for (int i = 1; i = num; i++) {
for (int j = 1; j = num – i + 1; j++) {
System.out.print(“*”);
}
System.out.println();
}
}
private static void t1(int num) {
for (int i = 1; i = num; i++) {
for (int j = 1; j = i; j++) {
System.out.print(“*”);
}
System.out.println();
}
}
}
怎樣用JAVA繪製一個菱形圖案
java 輸出菱形代碼:
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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(“”);
}
}
}
繪製算法:
1、分為兩部分,上半部分和下半部分
2、輸出空格部分換個輸出*部分
3、最後一個標籤需要換行
用java打印菱形。
一、整體實現思路:菱形9行9列可以將菱形分成上下兩個三角形,分析每行空格數和星號個數的關係。
二、一個三角形的實現思路:以輸出一個空心三角形為例:
(1)空格的輸出按-1遞減,字符的輸出按等差數列,公差為2
(2)判斷第一行和最後一行照常輸出。
(3)中間行僅輸出兩個字符。
三、菱形分實心和空心兩種,其代碼及解析分別如下:
(一)實心菱形。
1、函數代碼:
2、執行效果:
(二)空心菱形:
1、函數代碼如下:
2、執行效果:
擴展資料:
java打印的輸出方式解析:
1、print():print就是一般的標準輸出,但是不換行。
2、println():println和print基本沒什麼差別,就是最後會換行。
要分辨清楚System.out.print()和System.out.println()的區別。System.out.print()是單純的輸出,而System.out.println()的功能是輸出內容後換行,到達下一行,在使用時要注意區分兩者之間的不同。
原創文章,作者:小藍,如若轉載,請註明出處:https://www.506064.com/zh-hk/n/278922.html