public void initMusicModeControl() {
but_music.addMouseListener(new MouseAdapter() {
MyMenu popup_menuList = new MyMenu("播放曲目");
public void mouseClicked(MouseEvent e) {
int mod = e.getModifiers() & 4;
if (e.getButton() == MouseEvent.BUTTON1
&& e.getClickCount() == 2) {
int index = list.getSelectedIndex();
if (but_music.getActionCommand() == "true") {
changToMusicMode();
} else {
changToMoveMode(index);
}
} else if (mod != 0) {
System.out.println("Ok");
popup_menu.add(popup_menuList);
popup_menu.show(but_music, e.getX(), e.getY());
popupList.setSelectedIndex(list.getSelectedIndex());
popup_menuList.add(popupList);
}
}
});
}
上面代码中int mod = e.getModifiers() & 4的作用是什么，什么意思啊;
getModifiers()返回此类或接口以整数编码的 Java 语言修饰符是什么意思啊？
------解决方案--------------------------------------------------------
就是前面的修饰符，像public static之类的，只不过所有的修饰符都是不冲突的数字，这样一个数字就能代表多个修饰符，例如public 是 00000001而static 是 00000010，那么合在一起就是00000011 就代表public static了
具体的含义，请参见Modifier这个类
------解决方案--------------------------------------------------------
这个在Modifier类里面有定义的
- Java code
/* * Access modifier flag constants from <em>The Java Virtual * Machine Specification, Second Edition</em>, tables 4.1, 4.4, * 4.5, and 4.7. */ /** * The <code>int</code> value representing the <code>public</code> * modifier. */ public static final int PUBLIC = 0x00000001; /** * The <code>int</code> value representing the <code>private</code> * modifier. */ public static final int PRIVATE = 0x00000002; /** * The <code>int</code> value representing the <code>protected</code> * modifier. */ public static final int PROTECTED = 0x00000004; /** * The <code>int</code> value representing the <code>static</code> * modifier. */ public static final int STATIC = 0x00000008; /** * The <code>int</code> value representing the <code>final</code> * modifier. */ public static final int FINAL = 0x00000010; /** * The <code>int</code> value representing the <code>synchronized</code> * modifier. */ public static final int SYNCHRONIZED = 0x00000020; /** * The <code>int</code> value representing the <code>volatile</code> * modifier. */ public static final int VOLATILE = 0x00000040; /** * The <code>int</code> value representing the <code>transient</code> * modifier. */ public static final int TRANSIENT = 0x00000080; /** * The <code>int</code> value representing the <code>native</code> * modifier. */ public static final int NATIVE = 0x00000100; /** * The <code>int</code> value representing the <code>interface</code> * modifier. */ public static final int INTERFACE = 0x00000200; /** * The <code>int</code> value representing the <code>abstract</code> * modifier. */ public static final int ABSTRACT = 0x00000400; /** * The <code>int</code> value representing the <code>strictfp</code> * modifier. */ public static final int STRICT = 0x00000800; // Bits not (yet) exposed in the public API either because they // have different meanings for fields and methods and there is no // way to distinguish between the two in this class, or because // they are not Java programming language keywords static final int BRIDGE = 0x00000040; static final int VARARGS = 0x00000080; static final int SYNTHETIC = 0x00001000; static final int ANNOTATION= 0x00002000; static final int ENUM = 0x00004000;