@Test
public void test(){
// for (int i = 0; i < 100; i++) {
int i1 = new Random().nextInt(3);//1,2,3
String classPath = " ";
switch (i1){
case 0:
classPath = "java.util.Date";
break;
case 1:
classPath = "java.lang.Object";
break;
case 2:
classPath = "src.Person.java";
break;
}
try {
Object instance = getInstance(classPath);
System.out.println(instance);
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (NoSuchMethodException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (InvocationTargetException e) {
e.printStackTrace();
} catch (InstantiationException e) {
e.printStackTrace();
}
// }
}
/*
创建一个指定类的对象。
classPath:指定类的全类名
*/
public Object getInstance(String classPath) throws ClassNotFoundException, NoSuchMethodException, IllegalAccessException, InvocationTargetException, InstantiationException {
Class aClass = Class.forName(classPath);
return aClass.getDeclaredConstructor().newInstance();
}
D:\Java\jdk-17.0.2\bin\java.exe -ea -Didea.test.cyclic.buffer.size=1048576 "-javaagent:C:\Program Files\JetBrains\IntelliJ IDEA 2020.3.4\lib\idea_rt.jar=50075:C:\Program Files\JetBrains\IntelliJ IDEA 2020.3.4\bin" -Dfile.encoding=UTF-8 -classpath "C:\Program Files\JetBrains\IntelliJ IDEA 2020.3.4\lib\idea_rt.jar;C:\Program Files\JetBrains\IntelliJ IDEA 2020.3.4\plugins\junit\lib\junit5-rt.jar;C:\Program Files\JetBrains\IntelliJ IDEA 2020.3.4\plugins\junit\lib\junit-rt.jar;D:\workspace_idea1\JavaSenior\out\production\day07;C:\Users\x\.m2\repository\junit\junit\4.12\junit-4.12.jar;C:\Users\x\.m2\repository\org\hamcrest\hamcrest-core\1.3\hamcrest-core-1.3.jar" com.intellij.rt.junit.JUnitStarter -ideVersion5 -junit4 NewInstanceTest,test
java.lang.ClassNotFoundException: src.Person.java
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:641)
at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:188)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:520)
at java.base/java.lang.Class.forName0(Native Method)
at java.base/java.lang.Class.forName(Class.java:375)
at NewInstanceTest.getInstance(NewInstanceTest.java:52)
at NewInstanceTest.test(NewInstanceTest.java:31)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:568)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
at org.junit
路径不对，不需要带后缀，把.java去掉就行了。
classPath = "src.Person.java";
改为：
classPath = "src.Person";
没找到这个java文件
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