Class 类中方法测试

package constxiong.interview;

/**
* 测试 Class 类相关
* @author ConstXiong
* @date 2019-06-14 10:13:05
*/
public class TestClass {

private int i = 0;
public int j = 1;

private void t() {
System.out.println("调用 TestClass 对象的 t() 方法");
}

public static void main(String[] args) throws ClassNotFoundException {
testClassMethod();
}

/**
* 测试 Class 对象的方法
*/
public static void testClassMethod() {
Class<TestClass> clazz = TestClass.class;
System.out.println("clazz.getName() --> " + clazz.getName());//获取类全名(包含路径)
System.out.println();
System.out.println("clazz.getSimpleName() --> " + clazz.getSimpleName());//获取类简称
System.out.println();
System.out.println("clazz.getSuperclass() --> " + clazz.getSuperclass());//获取父类
System.out.println();
System.out.println("clazz.isInterface() --> " + clazz.isInterface());//判断是否为接口
System.out.println();
System.out.println("clazz.getFields() --> " + join(clazz.getFields(), "\r\n"));//获取 public 字段,包含父类 public 字段
System.out.println();
System.out.println("clazz.getDeclaredFields() --> " + join(clazz.getDeclaredFields(), "\r\n"));//获取所有字段
System.out.println();
System.out.println("clazz.getMethods() --> " + join(clazz.getMethods(), "\r\n"));//获取 public 方法，包含父类 public 方法
System.out.println();
System.out.println("clazz.getDeclaredMethods() --> " + join(clazz.getDeclaredMethods(), "\r\n"));//获取所有字段
System.out.println();
System.out.println("clazz.getConstructors() --> " + join(clazz.getConstructors(), "\r\n"));//获取构造方法
System.out.println();
try {
clazz.newInstance().t();//实例化 TestClass 对象，调用对象中的 t() 方法
} catch (InstantiationException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
}

}



/**
* 拼接数组成字符串
* @param objs
* @param s
* @return
*/
private static String join(Object[] objs, String s) {
StringBuilder r = new StringBuilder(http://www.my516.com);
for (Object obj : objs) {
r.append(obj).append(s);
}
return r.toString();
}
}
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