spring JavaVersion 源码
springboot JavaVersion 代码
文件路径：/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/system/JavaVersion.java
/*
* Copyright 2012-2022 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.boot.system;
import java.io.Console;
import java.time.Duration;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import org.springframework.util.ClassUtils;
/**
* Known Java versions.
*
* @author Oliver Gierke
* @author Phillip Webb
* @since 2.0.0
*/
public enum JavaVersion {
/**
* Java 17.
*/
SEVENTEEN("17", Console.class, "charset"),
/**
* Java 18.
*/
EIGHTEEN("18", Duration.class, "isPositive");
private final String name;
private final boolean available;
JavaVersion(String name, Class<?> clazz, String methodName) {
this.name = name;
this.available = ClassUtils.hasMethod(clazz, methodName);
}
@Override
public String toString() {
return this.name;
}
/**
* Returns the {@link JavaVersion} of the current runtime.
* @return the {@link JavaVersion}
*/
public static JavaVersion getJavaVersion() {
List<JavaVersion> candidates = Arrays.asList(JavaVersion.values());
Collections.reverse(candidates);
for (JavaVersion candidate : candidates) {
if (candidate.available) {
return candidate;
}
}
return SEVENTEEN;
}
/**
* Return if this version is equal to or newer than a given version.
* @param version the version to compare
* @return {@code true} if this version is equal to or newer than {@code version}
*/
public boolean isEqualOrNewerThan(JavaVersion version) {
return compareTo(version) >= 0;
}
/**
* Return if this version is older than a given version.
* @param version the version to compare
* @return {@code true} if this version is older than {@code version}
*/
public boolean isOlderThan(JavaVersion version) {
return compareTo(version) < 0;
}
}
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- 本文标签： Spring Boot Java Spring
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