package Arrays; import java.lang.reflect.Array; import java.net.URL; import java.util.Arrays; public class ArrayTest { public static void main(String[] args) { String[] strings = { "123", "234", "345" }; Integer aInteger = 1; String string = "12"; aInteger.getClass().getClassLoader(); System.out.println("Integer 的内部类"); Class[] classes = aInteger.getClass().getDeclaredClasses(); for (Class class1 : classes) { System.out.println(class1.getName().toString()); } System.out.println(); Class[] classes2 = aInteger.getClass().getClasses(); for (Class class1 : classes2) { System.out.println(class1.getName().toString()); } // getComponentType返回的是数组的组件类型，如果不是数组，返回null System.out.println("ComponentType:" + strings.getClass().getComponentType()); // newInstance创建一个指定实例，指定长度的新数组 Object object = Array.newInstance(strings.getClass().getComponentType(), 5); String[] strings2 = (String[]) object; System.out.println(Arrays.toString(strings2)); URL url1 = ArrayTest.class.getResource("/"); URL url2 = ArrayTest.class.getClassLoader().getResource("/"); System.out.println(url1.toString()); System.out.println(url2); String string2="abcdefg"; char[] chars={1,2,3}; string2.getChars(0, 2, chars, 0); System.out.println("chars:"+Arrays.toString(chars)); } }