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ArrayTest.java
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46 lines (36 loc) · 1.38 KB
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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));
}
}