返回:如果参数不为 null,且这两个 string 在忽略大小写时相等,则返回 true。这个进程中含有一个不位于前台的activity,但是仍然对用户是可见的(这个activity的onpause()方法被调用),这是很可能发生的,例如,如果前台activity是一个对话框的话,就会允许在它后面看到前一个activity。
l这说明我们只需要重写ClassLoader的findClass()方法,这就可以了!如果重写了loadClass()方法覆盖了代理模式!
OK,通过上面的分析,我们知道要自定义一个类加载器,只需要继承ClassLoader类,然后重写它的findClass()方法即可。那么在findClass()方法中我们要完成哪些工作呢?
l找到class文件,把它加载到一个byte[]中;
l调用defineClass()方法,把byte[]传递给这个方法即可。
FileSystemClassLoader
publicclassFileSystemClassLoader extendsClassLoader {
privateString classpath;
publicFileSystemClassLoader() {}
publicFileSystemClassLoader(String classpath) {
this.classpath= classpath;
}
@Override
publicClass<?> findClass(String name) throwsClassNotFoundException {
try{
byte[] datas = getClassData(name);
if(datas == null) {
thrownewClassNotFoundException("类没有找到:"+ name);
}
if you are building activemq 4.x under windows using cygwin there is a path name length limitation. if the path name length is exceeded, you may see build errors. to correct this, move the activemq source directory higher in the file system tree, e.g., /cygdrive/c/d/sm.。xpath='//*[string-length(name()) = 2]'。
} catch(IOException e) {
e.printStackTrace();
thrownewClassNotFoundException("类找不到:"+ name);
}
}
privatebyte[] getClassData(String name) throwsIOException {
name = name.replace(".", "\\") + ".class";
File classFile = newFile(classpath, name);
event: 0.980 thread 0x0000000002482800 exception (0x00000000eba3a648) thrown at [c:/workspace/8-2-build-windows-amd64-cygwin/jdk8u65/4987/hotspot/src/share/vm/classfile/systemdictionary.cpp, line 210]。event: 0.984 thread 0x0000000002482800 exception (0x00000000eba8aaa8) thrown at [c:/workspace/8-2-build-windows-amd64-cygwin/jdk8u65/4987/hotspot/src/share/vm/classfile/systemdictionary.cpp, line 210]。
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