forked from plusone/plusone-commons
64 lines
1.9 KiB
Java
64 lines
1.9 KiB
Java
/*
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* Copyright 2023-2024 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package xyz.zhouxy.plusone.commons.base;
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import xyz.zhouxy.plusone.commons.util.StringTools;
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/**
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* JRE version
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*/
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public class JRE {
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private static final int JAVA_8 = 8;
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public static final int CURRENT_VERSION = getJre();
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public static boolean isJava8() {
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return CURRENT_VERSION == JAVA_8;
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}
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private static int getJre() {
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String version = System.getProperty("java.version");
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boolean isNotBlank = StringTools.isNotBlank(version);
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if (isNotBlank && version.startsWith("1.8")) {
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return JAVA_8;
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}
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// if JRE version is 9 or above, we can get version from
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// java.lang.Runtime.version()
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try {
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return getMajorVersion(version);
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} catch (Exception e) {
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// assuming that JRE version is 8.
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}
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// default java 8
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return JAVA_8;
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}
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private static int getMajorVersion(String version) {
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if (version.startsWith("1.")) {
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return Integer.parseInt(version.substring(2, 3));
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} else {
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int dotIndex = version.indexOf(".");
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return (dotIndex != -1) ? Integer.parseInt(version.substring(0, dotIndex)) : Integer.parseInt(version);
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}
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}
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private JRE() {
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throw new IllegalStateException("Utility class");
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}
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}
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