标签：fileinput list() osi 图片 case ted equal ngx throw
/**
* @Getter注解
* 为属性生成get方法
*/
public class GetterTest {
@Getter(
lazy = true
)
private final String field1 = "zhangxiaoxi";
@Getter(
value = AccessLevel.PRIVATE,
onMethod_={@NotNull}
)
private String field2;
}
/**
* @Setter注解
* 为属性生成set方法
*/
public class SetterTest {
@Setter
private String field1;
@Setter(
value = AccessLevel.PRIVATE,
onParam_={@NotNull}
)
private String field2;
}
/**
* @ToString注解
* 生成toString方法
*/
@ToString(
includeFieldNames = false,
// exclude = {"field1"},
// of = {"field1"},
doNotUseGetters = false
)
public class ToStringTest {
@Setter
private String field1;
@Setter
private String field2;
public String getField2() {
System.out.println("调用get方法！");
return this.field2;
}
@Test
public void test() {
ToStringTest toStringTest = new ToStringTest();
toStringTest.setField1("zhang");
toStringTest.setField2("xiaoxi");
System.out.println(toStringTest.toString());
}
}
/**
* @EqualsAndHashCode注解
* 生成Equals方法和HashCode方法
*/
@EqualsAndHashCode(
exclude = {"field1"}
)
public class EqualsAndHashCodeTest {
private String field1;
private String field2;
}
/**
* @Data注解
* 大而全的注解：包含@Getter，@Setter，@ToString，@EqualsAndHashCode
*/
@Data
public class DataTest {
private String field1;
private String field2;
}
/**
* @val注解
* 弱语言变量，编译器根据类型推断自动生成变量声明
*/
public class ValTest {
public ValTest() {
val field = "zhangxiaoxi";
val list = new ArrayList<String>();
list.add("zhangxiaoxi");
}
}
/**
* @NonNull注解
* 生成非空检查
*/
public class NonNullTest {
public NonNullTest(@NonNull String field) {
System.out.println(field);
}
}
/**
* @AllArgsConstructor
* @NoArgsConstructor
* @RequiredArgsConstructor
*/
@RequiredArgsConstructor
public class ConstructorTest {
private final String field1;
@NonNull
private String field2;
private String field3;
}
/**
* @Cleanup注解
* 资源关闭
*/
public class CleanupTest {
public void copyFile(String in, String out)
throws Exception {
@Cleanup FileInputStream fileInputStream =
new FileInputStream(in);
@Cleanup FileOutputStream fileOutputStream =
new FileOutputStream(out);
int r;
while ((r = fileInputStream.read()) != -1) {
fileOutputStream.write(r);
}
}
}
<!-- https://mvnrepository.com/artifact/org.slf4j/slf4j-api -->
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>1.7.30</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.slf4j/slf4j-jdk14 -->
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-jdk14</artifactId>
<version>1.7.30</version>
<scope>test</scope>
</dependency>
/**
* 类名称：LogTest
* ********************************
* <p>
* 类描述：@Slf4j注解
*
* @author zhangxiaoxi
* @date 下午6:00
*/
@Slf4j
public class LogTest {
@Test
public void func() {
log.error("日志！！！");
}
}
/**
* 类名称：BuilderTest
* ********************************
* <p>
* 类描述：@Builder和@Singular注解
*
* TODO 总结一下
* @Builder注解帮助我们完成的工作：
* 1. 一个名为XxxBuilder的内部静态类，成为构建器
* 2. 构建器中，对于目标类的所有属性和未初始化的final字段，都会在构建器中创建对应的属性
* 3. 构建器中，对每个属性都会创建一个同名的方法，用于为此属性赋值。并且支持链式调用
* 4. 构建器中，build方法会根据设置的属性值来创建实体对象
* 5. 实体类中，生成所有属性和未初始化的final字段的构造方法
* 6. 实体类中，会创建builder方法，用来生成构建器
*
* @Singular注解帮助我们完成的工作：
* 1. 构建器中，生成一个向集合添加单个元素的方法
* 2. 构建器中，生成一个向集合添加另一个集合的方法
* 3. 构建器中，生成一个清除集合元素的方法
* 4. build方法创建集合时，将根据集合元素多少创建不同的集合，并且创建的集合都是不可变的
*
* @author zhangxiaoxi
* @date 下午6:13
*/
@Builder
@Data
public class BuilderTest {
/**
* 静态属性：不能赋值的
*/
private static String staticField;
/**
* final属性
*/
private final String finalField;
/**
* 已初始化的Final字段：不能赋值的
*/
private final String initFinalField = "已初始化的Final字段！";
/**
* 普通属性
*/
private String field = "普通属性Field!";
/**
* 集合类属性
*/
@Singular
private List<String> listFields;
/**
* main
* @param args
*/
public static void main(String[] args) {
BuilderTest builderTest = BuilderTest
// builder创建一个可以链式赋值的对象
.builder()
// 为这个对象的"每个"字段赋值
.finalField("手动赋值FinalField字段")
// .field("手动赋值Field字段")
// .listFields(new ArrayList<>())
.listField("zhangxiaoxi")
.listField("lisi")
// build方法来创建对象。
// TODO 完成了对象的创建。此时创建出来的对象，是不可变的！！！
.build();
System.out.println(
JSON.toJSONString(builderTest, true));
}
}
经过编译后的部分源代码
//
// Source code recreated from a .class file by IntelliJ IDEA
// (powered by Fernflower decompiler)
//
public class BuilderTest {
private static String staticField;
private final String finalField;
private final String initFinalField = "已初始化的Final字段！";
private String field = "普通属性Field!";
private List<String> listFields;
public static void main(String[] args) {
BuilderTest builderTest = builder().finalField("手动赋值FinalField字段").listField("zhangxiaoxi").listField("lisi").build();
System.out.println(JSON.toJSONString(builderTest, true));
}
public static BuilderTest.BuilderTestBuilder builder() {
return new BuilderTest.BuilderTestBuilder();
}
public static class BuilderTestBuilder {
private String finalField;
private String field;
private ArrayList<String> listFields;
BuilderTestBuilder() {
}
public BuilderTest.BuilderTestBuilder finalField(String finalField) {
this.finalField = finalField;
return this;
}
public BuilderTest.BuilderTestBuilder field(String field) {
this.field = field;
return this;
}
public BuilderTest.BuilderTestBuilder listField(String listField) {
if (this.listFields == null) {
this.listFields = new ArrayList();
}
this.listFields.add(listField);
return this;
}
public BuilderTest.BuilderTestBuilder listFields(Collection<? extends String> listFields) {
if (this.listFields == null) {
this.listFields = new ArrayList();
}
this.listFields.addAll(listFields);
return this;
}
public BuilderTest.BuilderTestBuilder clearListFields() {
if (this.listFields != null) {
this.listFields.clear();
}
return this;
}
public BuilderTest build() {
List listFields;
// 注意这一段代码：第一，singletonList可见设计者有性能方面的考虑，在用心的做这个功能；第二，集合是不可变的，builder模式的思想就是对象的使用和创建完全分开，创建出来的对象只能使用，不能再修改
switch(this.listFields == null ? 0 : this.listFields.size()) {
case 0:
listFields = Collections.emptyList();
break;
case 1:
listFields = Collections.singletonList(this.listFields.get(0));
break;
default:
listFields = Collections.unmodifiableList(new ArrayList(this.listFields));
}
return new BuilderTest(this.finalField, this.field, listFields);
}
public String toString() {
return "BuilderTest.BuilderTestBuilder(finalField=" + this.finalField + ", field=" + this.field + ", listFields=" + this.listFields + ")";
}
}
}
标签：fileinput list() osi 图片 case ted equal ngx throw
原文地址：https://www.cnblogs.com/hongzuiliyu/p/14290124.html
