Share the learning path of Java database

When learning any programming language, database is one of the must-learns. The key point is also one of the difficulties. Next, let’s talk about how to learn Java programming and database learning.

1. Database type structure diagram

Collection---->Collections Map----->SortedMap------>TreeMap

Collection---->List----->(Vector \ ArryList \ LinkedList) Map------>HashMap

Collection---->Set---- -->(HashSet \ LinkedHashSet \ SortedSet)

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2. Partial diagram of stack memory, heap memory, and string constant pool

##http://www.php.cn/java -article-375796.html

3.JAVA basic data type diagram

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4. Automatic type change diagram

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5. Type conversion - reduce/enlarge conversion diagram

import java.awt.AlphaComposite;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Toolkit;
import java.awt.color.ColorSpace;
import java.awt.geom.AffineTransform;
import java.awt.image.AffineTransformOp;
import java.awt.image.BufferedImage;
import java.awt.image.ColorConvertOp;
import java.awt.image.CropImageFilter;
import java.awt.image.FilteredImageSource;
import java.awt.image.ImageFilter;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;

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6. Forced type conversion

public static byte[]
 toByteArray(int number){
  int temp
 = number;
  byte[]
 b=new byte[4];
  for (int i
 = b.length - 1;
 i > -1;
 i--)
  {
     b[i]
 = new Integer(temp
 & 0xff).byteValue();
     temp
 = temp >> 8;
  }
  return b;
}

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