20个开发人员非常有用的Java功能代码

1. 把Strings转换成int和把int转换成String

String a = String.valueOf(2); //integer to numeric string int i = Integer.parseInt(a); //numeric string to an int String a = String.valueOf(2); //integer to numeric string int i = Integer.parseInt(a); //numeric string to an int

2. 向Java文件中添加文本

Updated: Thanks Simone for pointing to exception. I have

changed the code. BufferedWriter out = null; try

{ out = new BufferedWriter(new FileWriter(”

filename”, true)); out.write(”

aString”); } catch (IOException e) {

// error processing code } finally

{ if (out != null) {

out.close();

} }
BufferedWriter out = null;try {out = new BufferedWriter(new

FileWriter(”filename”, true));out.write(”aString”);} catch

(IOException e) {// error processing code} finally {if (out

!= null) {out.close();}}

3. 获取Java现在正调用的方法名

String methodName = Thread.currentThread().getStackTrace()[1].getMethodName(); String methodName = Thread.currentThread().getStackTrace()[1].getMethodName ();

13. 在Java上做屏幕截图

Read this article for more details.import

java.awt.Dimension; import java.awt.Rectangle;

import java.awt.Robot; import java.awt.Toolkit;

import java.awt.image.BufferedImage; import

javax.imageio.ImageIO; import java.io.File; ... public void captureScreen(String fileName)

throws Exception { Dimension screenSize =

Toolkit.getDefaultToolkit().getScreenSize(); Rectangle

screenRectangle = new Rectangle(screenSize); Robot

robot = new Robot(); BufferedImage image =

robot.createScreenCapture(screenRectangle); ImageIO.write(image, "png", new File(fileName)); }

...
import java.awt.Dimension;import java.awt.Rectangle;import

java.awt.Robot;import java.awt.Toolkit;import

java.awt.image.BufferedImage;import javax.imageio.ImageIO;import

java.io.File;
...
public void captureScreen(String fileName) throws Exception {
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize

();Rectangle screenRectangle = new Rectangle

(screenSize);Robot robot = new Robot();BufferedImage image = robot.createScreenCapture(screenRectangle);ImageIO.write(image, "png", new File(fileName));
}...

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