java代码gdb,java代码例子
Java简单问题求编程
public class Demo {
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public static void main(String[] args) {
Demo demo = new Demo();
demo.question1();
demo.question2();
demo.question3();
demo.question4();
demo.question5();
demo.question6();
}
private void question1() {
System.out.println("Q1:");
Scanner scanner = new Scanner(System.in);
System.out.println("请输入第一个数:");
int num1 = scanner.nextInt();
System.out.println("请输入第二个数:");
int num2 = scanner.nextInt();
System.out.println("和: " + (num1 + num2));
System.out.println("差: " + (num1 - num2));
System.out.println("积: " + (num1 * num2));
String value = String.valueOf((double) num1 / num2);
System.out.println("商: " + (value.substring(0, value.indexOf("."))));
System.out.println("余数: " + (num1 % num2));
}
private void question2() {
System.out.println("Q2:");
Scanner scanner = new Scanner(System.in);
System.out.println("请输入圆柱体地面半径: ");
double r = scanner.nextDouble();
System.out.println("请输入圆柱体高: ");
double h = scanner.nextDouble();
System.out.println("圆柱体体积: " + (Math.PI * Math.pow(r, 2) * h));
}
private void question3() {
System.out.println("Q3:");
Scanner scanner = new Scanner(System.in);
System.out.println("清输入年份: ");
int year = scanner.nextInt();
System.out.println(year + (year % 4 == 0 year % 100 != 0 || year % 400 == 0 ? "是" : "不是") + "闰年");
}
private void question4() {
System.out.println("Q4:");
double gdb = 100;
int i = 0;
for (; gdb gdb * 2; i++) {
gdb += gdb * 0.08;
}
System.out.println("经过" + i + "年,GDP可以翻一番");
}
private void question5() {
System.out.println("Q5:");
Scanner scanner = new Scanner(System.in);
System.out.println("请输入10个数,用空格隔开: ");
String input = scanner.nextLine();
String[] numbers = input.split("\\s");
int min = Integer.parseInt(numbers[0]);
int max = Integer.parseInt(numbers[0]);
for (int i = 1; i 10; i++) {
int number = Integer.parseInt(numbers[i]);
max = Math.max(number, max);
min = Math.min(number, min);
}
System.out.println("最大值: " + max + ", 最小值: " + min);
}
private void question6() {
System.out.println("Q6:");
Scanner scanner = new Scanner(System.in);
System.out.println("请输入第一个数: ");
int num1 = scanner.nextInt();
System.out.println("请输入第二个数: ");
int num2 = scanner.nextInt();
for (int i = Math.max(num1, num2); i 0; i--) {
if (num1 % i == 0 num2 % i == 0) {
System.out.println("最大公约数: " + i);
break;
}
}
for (int i = Math.max(num1, num2); ; i++) {
if (i % num1 == 0 i % num2 == 0) {
System.out.println("最小公倍数: " + i);
break;
}
}
}
}
java语言gdbc是什么意思
是jdbc不是gdbc就是java database connection也就是java操作数据库的一组api
java怎样将网页上面的数据以pdf的格式导出,求代码
需要用到一个pdf的jar包,去网上下载一个itextpdf.jar。导出pdf的格式都是需要自己用代码实现的,每一行 ,每一个列是什么格式,都需要自己写出来,是不能够自动生成的,反正很麻烦。我做的一个导出成pdf特定格式的东西,写了好几千行代码。相当头痛。
package com.dw.mqs.export;
import java.awt.Color;
import java.io.ByteArrayOutputStream;
import java.math.BigDecimal;
import java.net.URL;
import java.util.Date;
import java.util.HashSet;
import java.util.Hashtable;
import java.util.List;
import java.util.Map;
import java.util.Set;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.dw.file.WebHelper;
import com.dw.mqs.MqsManager;
import com.dw.mqs.MqsUtilNew;
import com.dw.mqs.ProductItem;
import com.dw.mqs.ProjectBasicItem;
import com.dw.mqs.ProjectConfDetailItem;
import com.dw.mqs.ProjectConfVerItem;
import com.dw.mqs.ProjectConfig;
import com.dw.mqs.ProjectService;
import com.dw.mqs.Util;
import com.dw.system.Convert;
import com.dw.system.gdb.DBResult;
import com.dw.system.gdb.DataRow;
import com.dw.system.gdb.GDB;
import com.dw.user.User;
import com.dw.user.UserManager;
import com.dw.user.UserProfile;
import com.lowagie.text.Document;
import com.lowagie.text.Element;
import com.lowagie.text.Font;
import com.lowagie.text.Image;
import com.lowagie.text.PageSize;
import com.lowagie.text.Paragraph;
import com.lowagie.text.Rectangle;
import com.lowagie.text.pdf.BaseFont;
import com.lowagie.text.pdf.PdfPCell;
import com.lowagie.text.pdf.PdfPTable;
import com.lowagie.text.pdf.PdfWriter;
public class PdfService
{
Document document = new Document(PageSize.A4.rotate(), 50, 50, 50, 50);
ByteArrayOutputStream os = new ByteArrayOutputStream();
PdfWriter pdf = PdfWriter.getInstance(document, os);
Rectangle rect = new Rectangle(36, 54, 559, 788);
pdf.setBoxSize("art", rect);
pdf.setPageEvent(new TableHeader());
document.open();
BaseFont baseArialuni = BaseFont.createFont("res/ARIALUNI.TTF",
BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED); // Arial
// unicode字体
Font fontCN = new Font(baseArialuni, 9, Font.NORMAL, Color.BLACK);
Font fontCN8b = new Font(baseArialuni, 9, Font.BOLD, Color.BLACK);
Font fontCN12b = new Font(baseArialuni, 12, Font.BOLD, Color.BLACK);
Font fontCN9b = new Font(baseArialuni, 10, Font.BOLD, Color.BLACK);
Font fontCN9 = new Font(baseArialuni, 10, Font.NORMAL, Color.BLACK);
Font fontCN9b_blue = new Font(baseArialuni, 10, Font.BOLD, Color.BLUE);
PdfPTable table = null;
PdfPCell cell = null;
table = new PdfPTable(relativeWidths);
table.setWidthPercentage(100);
cell = new PdfPCell(new Paragraph(tit + "标题", fontCN12b));
cell.setColspan(root ? 12 : 10);
cell.setHorizontalAlignment(Element.ALIGN_CENTER); // 水平居中
cell.setVerticalAlignment(Element.ALIGN_MIDDLE); // 垂直居中
cell.setBorder(Rectangle.NO_BORDER);
table.addCell(cell);
}
如何使用jdb调试android的java程序
1)下载jdbshell并编译
因为我基本上每次一开始都要执行threads变量,所以我在开始wile循环前加了一句话
else
{
close(parent_to_child[0]);
write(parent_to_child[1], "threads\n",strlen("threads\n"));
while(1)
{
int i = 0;
line = readline ("");
...
}
}
编译后将jdbshell放到~/bin,或者将目录加到PATH里
出现无法打开readline.h的话,安装libreadline6和libreadline6-dev
2)仿照gdbclient,在build/envsetup.sh中加入jdbclient函数
function jdbclient()
{
local MY_SRC_PATH="$1"
if [ "$MY_SRC_PATH" ] ; then
MY_SRC_PATH=$1
echo $MY_SRC_PATH
else
echo "ROOT" $OUR_ROOT
MY_SRC_PATH="app_process"
fi
local PORT="$2"
if [ "$PORT" ] ; then
PORT=$2
else
PORT=":9000"
fi
local PID
local PROG="$3"
if [ "$PROG" ] ; then
PID=`pid $3`
echo tcp$PORT jdwp$PID
adb forward "tcp$PORT" "jdwp:$PID"
echo jdbshell -sourcepath $MY_SRC_PATH -attach localhost$PORT
jdbshell -sourcepath $MY_SRC_PATH -attach localhost$PORT
sleep 2
else
echo ""
echo "please specify app you want to debug:"
echo ""
fi
}
3)启动android模拟器,运行浏览器
4)jdbclient packets/app/Browser/src/ :9000 browser
第一个参数是你要load进来的代码的地址,如果你要load多个代码(调试的时候可以看),可以
export DEBUG_SRC_PATH=
然后
jdbclient $DEBUG_SRC_PATH :9000 browser
第二个参数是attach端口,如果9000有在用,可以用其他端口
第三个参数是要调试的应用,脚本里面根据
pid browser来取得进程id,所以你要保证
adb shell ps |grep browser
能够看到对应的进程
gdb java core 怎么调试
有一种办法是, 我们用gdb的step, 一步一步寻找.
这放在短小的代码中是可行的, 但要让你step一个上万行的代码, 我想你会从此厌恶程序员这个名字, 而把他叫做调试员.
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