@SupportedAnnotationTypes(value = {"club.throwable.processor.Test"})
@SupportedSourceVersion(value = SourceVersion.RELEASE_8)
public class AnnotationProcessor extends AbstractProcessor {
@Override
public boolean process(Set annotations, RoundEnvironment roundEnv) {
System.out.println("Log in AnnotationProcessor.process");
for (TypeElement typeElement : annotations) {
System.out.println(typeElement);
}
System.out.println(roundEnv);
return true;
}
}
编写一个主类：
public class Main {
public static void main(String[] args) throws Exception{
System.out.println("success");
test();
}
@Test(value = "method is test")
public static void test()throws Exception{
}
}
[ERROR] Bad service configuration file, or exception thrown while
constructing Processor object: javax.annotation.processing.Processor:
Provider club.throwable.processor.AnnotationProcessor not found
public class Person {
private Integer age;
private String name;
public Integer getAge() {
return age;
}
@Builder
public void setAge(Integer age) {
this.age = age;
}
public String getName() {
return name;
}
@Builder
public void setName(String name) {
this.name = name;
}
}
生成的Builder类如下：
public class PersonBuilder {
private Person object = new Person();
public Person build() {
return object;
}
public PersonBuilder setName(java.lang.String value) {
object.setName(value);
return this;
}
public PersonBuilder setAge(int value) {
object.setAge(value);
return this;
}
}
自定义的注解如下：
@Target({ElementType.METHOD})
@Retention(RetentionPolicy.SOURCE)
public @interface Builder {
}
public class Main {
public static void main(String[] args) throws Exception{
//PersonBuilder在编译之后才会生成，这里需要编译后才能这样写
Person person = new PersonBuilder().setAge(25).setName("doge").build();
}
}
package club.throwable.processor.builder;
public class PersonBuilder {
private Person object = new Person();
public PersonBuilder() {
}
public Person build() {
return this.object;
}
public PersonBuilder setName(String value) {
this.object.setName(value);
return this;
}
public PersonBuilder setAge(Integer value) {
this.object.setAge(value);
return this;
}
}
public class Server
{
//用来存储所有连接上来的客户
private List<ServerThread> clients;
public static void main(String[] args)
{
Server s = new Server();
s.startServer(9988);
}
publi
I got serveral questions about auto.offset.reset. This configuration parameter governs how consumer read the message from Kafka when there is no initial offset in ZooKeeper or
two cursors.
Make the first cursor go K steps first.
/*
* 第 13 题：题目：输入一个单向链表，输出该链表中倒数第 k 个节点
*/
public void displayKthItemsBackWard(ListNode head,int k){
ListNode p1=head,p2=head;
一、sh 脚本不执行的原因
sh脚本不执行的原因 只有2个
1.权限不够
2.sh脚本里路径没写完整。
二、解决You have new mail in /var/spool/mail/root
修改/usr/share/logwatch/default.conf/logwatch.conf配置文件
MailTo =
MailFrom
三、查询连接数
$ git push joe prod-2295-1
To [email protected]:joe.le/dr-frontend.git
! [rejected] prod-2295-1 -> prod-2295-1 (non-fast-forward)
error: failed to push some refs to '[email protected]
