Java Type VS Hibernate Type
Java Class Attribute Type Hibernate Type Possible SQL Type-Vendor Specific
Integer, int, long short integer, long, short Appropriate SQL type
char character char
java.math.BigDecimal big_decimal NUMERIC, NUMBER
float, double float, double float, double
java.lang.Boolean, boolean boolean, yes_no, boolean, int
true_false
java.lang.string string &
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package test;
import java.io.File;
import org.jivesoftware.smack.Chat;
import org.jivesoftware.smack.ConnectionConfiguration;
import org.jivesoftware.smack.MessageListener;
import org.jivesoftware.smack.XMPPConnection;
import org.jivesoftware.smack.XMPPException;
import org.jivesoftware.smack ......
boolean java.lang.Object.equals(Object obj)
Indicates whether some other
object is "equal to" this one.
The equals method implements an
equivalence relation on non-null object references:
It is reflexive: for
any non-null reference value x, x.equals(x) should return true.
It ......
³ Java 语言中，对各种变量、方法和类等要素命名时使用的字符序列称为标识符。
--凡是自己可以起名字的地方都叫标示符，都遵守标示符的规则。
³ Java 标识符有如下命名规则：
– 标识符由字母� ......
// 注册应用程序全局键盘事件, 所有的键盘事件都会被此事件监听器处理.
Toolkit tk = Toolkit.getDefaultToolkit();
tk.addAWTEventListener(new MyAWTEventListener(), AWTEvent.KEY_EVENT_MASK);
class MyAWTEventListener implements AWTEventListener {
private boolean controlPressed = fal ......
