java 8 与 java 7 ， 包 与 类 新增和删除的对比
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互联网集市收集整理的这篇技术教程文章主要介绍了java 8 与 java 7 ， 包 与 类 新增和删除的对比，小编现在分享给大家，供广大互联网技能从业者学习和参考。文章包含11450字，纯文字阅读大概需要17分钟。
内容图文
java8 新增：
java.time java.util.function java.util.stream com.sun.source.doctree com.sun.org.apache.xml.internal.security.signature.reference
java.beans.MethodRef.java java.io.DefaultFileSystem.java java.io.UncheckedIOException.java java.lang.FunctionalInterface.java java.net.HostPortrange.java java.net.HttpConnectSocketImpl.java java.net.InetAddressContainer.java java.net.package-info.java java.net.URLPermission.java java.nio.CharBufferSpliterator.java java.security.DomainLoadStoreParameter.java java.security.package-info.java java.security.PKCS12Attribute.java java.sql.DriverAction.java java.sql.JDBCType.java java.sql.SQLType.java java.util.ArrayPrefixHelpers.java java.util.ArraysParallelSortHelpers.java java.util.Base64.java java.util.Comparators.java java.util.DoubleSummaryStatistics.java java.util.IntSummaryStatistics.java java.util.LongSummaryStatistics.java java.util.Optional.java java.util.OptionalDouble.java java.util.OptionalInt.java java.util.OptionalLong.java java.util.PrimitiveIterator.java java.util.Spliterator.java java.util.Spliterators.java java.util.SplittableRandom.java java.util.StringJoiner.java java.util.Tripwire.java javax.tools.DocumentationTool.java com.sun.javadoc.AnnotatedType.java com.sun.javadoc.package-info.java java.lang.annotation.Native.java java.lang.annotation.Repeatable.java java.lang.invoke.AbstractValidatingLambdaMetafactory.java java.lang.invoke.InfoFromMemberName.java java.lang.invoke.InnerClassLambdaMetafactory.java java.lang.invoke.LambdaConversionException.java java.lang.invoke.LambdaMetafactory.java java.lang.invoke.ProxyClassesDumper.java java.lang.invoke.SerializedLambda.java java.lang.invoke.Stable.java java.lang.invoke.TypeConvertingMethodAdapter.java java.lang.reflect.AnnotatedArrayType.java java.lang.reflect.AnnotatedParameterizedType.java java.lang.reflect.AnnotatedType.java java.lang.reflect.AnnotatedTypeVariable.java java.lang.reflect.AnnotatedWildcardType.java java.lang.reflect.Executable.java java.lang.reflect.MalformedParametersException.java java.lang.reflect.Parameter.java java.lang.reflect.WeakCache.java java.nio.file.FileTreeIterator.java java.security.acl.package-info.java java.security.cert.CertPathChecker.java java.security.cert.package-info.java java.security.cert.PKIXRevocationChecker.java java.security.interfaces.package-info.java java.security.spec.DSAGenParameterSpec.java java.security.spec.package-info.java java.util.concurrent.CompletableFuture.java java.util.concurrent.CompletionException.java java.util.concurrent.CompletionStage.java java.util.concurrent.CountedCompleter.java java.util.spi.CalendarDataProvider.java java.util.spi.CalendarNameProvider.java java.util.spi.ResourceBundleControlProvider.java java.util.zip.ZipUtils.java javax.lang.model.AnnotatedConstruct.java javax.management.timer.TimerAlarmClock.java javax.rmi.CORBA.ClassDesc.java javax.rmi.CORBA.GetORBPropertiesFileAction.java javax.rmi.CORBA.PortableRemoteObjectDelegate.java javax.rmi.CORBA.Stub.java javax.rmi.CORBA.StubDelegate.java javax.rmi.CORBA.Tie.java javax.rmi.CORBA.Util.java javax.security.auth.package-info.java javax.security.cert.package-info.java javax.security.sasl.package-info.java javax.xml.validation.SchemaFactoryConfigurationError.java com.sun.jmx.snmp.SnmpPermission.java com.sun.security.auth.package-info.java com.sun.security.jgss.ExtendedGSSCredential.java com.sun.security.jgss.package-info.java com.sun.source.tree.AnnotatedTypeTree.java com.sun.source.tree.IntersectionTypeTree.java com.sun.source.tree.LambdaExpressionTree.java com.sun.source.tree.MemberReferenceTree.java com.sun.source.util.DocSourcePositions.java com.sun.source.util.DocTreePath.java com.sun.source.util.DocTreePathScanner.java com.sun.source.util.DocTrees.java com.sun.source.util.DocTreeScanner.java com.sun.source.util.Plugin.java com.sun.source.util.SimpleDocTreeVisitor.java java.util.concurrent.atomic.DoubleAccumulator.java java.util.concurrent.atomic.DoubleAdder.java java.util.concurrent.atomic.LongAccumulator.java java.util.concurrent.atomic.LongAdder.java java.util.concurrent.atomic.Striped64.java java.util.concurrent.locks.StampedLock.java javax.lang.model.type.IntersectionType.java javax.lang.model.util.AbstractAnnotationValueVisitor8.java javax.lang.model.util.AbstractElementVisitor8.java javax.lang.model.util.AbstractTypeVisitor8.java javax.lang.model.util.ElementKindVisitor8.java javax.lang.model.util.ElementScanner8.java javax.lang.model.util.SimpleAnnotationValueVisitor8.java javax.lang.model.util.SimpleElementVisitor8.java javax.lang.model.util.SimpleTypeVisitor8.java javax.lang.model.util.TypeKindVisitor8.java javax.security.auth.callback.package-info.java javax.security.auth.kerberos.package-info.java javax.security.auth.login.package-info.java javax.security.auth.spi.package-info.java javax.security.auth.x500.package-info.java com.sun.imageio.plugins.bmp.BMPCompressionTypes.java com.sun.jmx.snmp.agent.AcmChecker.java com.sun.jmx.snmp.agent.LongList.java com.sun.security.auth.callback.package-info.java com.sun.security.auth.login.package-info.java com.sun.security.auth.module.package-info.java com.sun.corba.se.impl.util.IdentityHashtableEntry.java com.sun.org.apache.xalan.internal.utils.FeatureManager.java com.sun.org.apache.xalan.internal.utils.FeaturePropertyBase.java com.sun.org.apache.xalan.internal.utils.XMLSecurityManager.java com.sun.org.apache.xerces.internal.utils.XMLLimitAnalyzer.java com.sun.org.apache.xerces.internal.utils.XMLSecurityManager.java com.sun.org.apache.xml.internal.security.encryption.AbstractSerializer.java com.sun.org.apache.xml.internal.security.encryption.DocumentSerializer.java com.sun.org.apache.xml.internal.security.encryption.Serializer.java com.sun.org.apache.xml.internal.security.utils.ClassLoaderUtils.java com.sun.org.apache.xml.internal.security.utils.DOMNamespaceContext.java com.sun.org.apache.xml.internal.security.utils.JDKXPathAPI.java com.sun.org.apache.xml.internal.security.utils.JDKXPathFactory.java com.sun.org.apache.xml.internal.security.utils.Signature11ElementProxy.java com.sun.org.apache.xml.internal.security.utils.XalanXPathAPI.java com.sun.org.apache.xml.internal.security.utils.XalanXPathFactory.java com.sun.org.apache.xml.internal.security.utils.XPathAPI.java com.sun.org.apache.xml.internal.security.utils.XPathFactory.java com.sun.org.apache.xml.internal.serializer.utils.SerializerMessages_pt_BR.java com.sun.org.apache.xml.internal.security.c14n.implementations.CanonicalizerPhysical.java com.sun.org.apache.xml.internal.security.keys.content.DEREncodedKeyValue.java com.sun.org.apache.xml.internal.security.keys.content.KeyInfoReference.java com.sun.org.apache.xml.internal.security.utils.resolver.ResourceResolverContext.java com.sun.org.apache.xml.internal.security.keys.content.x509.XMLX509Digest.java com.sun.org.apache.xml.internal.security.keys.keyresolver.implementations.DEREncodedKeyValueResolver.java com.sun.org.apache.xml.internal.security.keys.keyresolver.implementations.KeyInfoReferenceResolver.java com.sun.org.apache.xml.internal.security.keys.keyresolver.implementations.PrivateKeyResolver.java com.sun.org.apache.xml.internal.security.keys.keyresolver.implementations.SecretKeyResolver.java com.sun.org.apache.xml.internal.security.keys.keyresolver.implementations.SingleKeyResolver.java com.sun.org.apache.xml.internal.security.keys.keyresolver.implementations.X509DigestResolver.java
java8 删除：
sunw com.sun.mirror com.sun.jmx.trace java.io.Win32FileSystem.java java.net.NetUtil.java java.text.BreakDictionary.java java.text.CollationRules.java java.text.DictionaryBasedBreakIterator.java java.text.RuleBasedBreakIterator.java java.util.XMLUtils.java java.lang.invoke.InvokeGeneric.java com.sun.security.auth.PolicyParser.java com.sun.security.auth.SubjectCodeSource.java com.sun.org.apache.bcel.internal.util.Objects.java com.sun.org.apache.xalan.internal.utils.Objects.java com.sun.org.apache.xerces.internal.utils.Objects.java com.sun.org.apache.xml.internal.security.utils.CachedXPathAPIHolder.java com.sun.org.apache.xml.internal.security.utils.CachedXPathFuncHereAPI.java com.sun.org.apache.xml.internal.security.utils.XPathFuncHereAPI.java com.sun.org.apache.xml.internal.security.transforms.implementations.FuncHereContext.java
对比方法：
下载jdk7 和jdk8 ，解压其中的src.zip文件，分别放在 D:\\tmp\\java7 和 D:\\tmp\\java8 下面
使用如下代码进行处理（jdk8编译运行）：
package test;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Arrays;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Queue;
import java.util.WeakHashMap;
public class Main {
public static void main(String[] args) throws IOException {
// 比较
File java7 = new File("D:\\tmp\\java7");
File java8 = new File("D:\\tmp\\java8");
Pair<File, File> root = new Pair<>(java7, java8);
Queue<Pair<File, File>> queue = new LinkedList<>();
queue.add(root);
List<File> removed = new LinkedList<>();
List<File> add = new LinkedList<>();
while (!queue.isEmpty()) {
Pair<File, File> p = queue.poll();
File j7dir = p.getFirst();
File j8dir = p.getSecond();
if (j7dir.isDirectory()) {
List<File> j7files = Arrays.asList(j7dir.listFiles());
List<File> j8files = Arrays.asList(j8dir.listFiles());
Map<String, File> j7names = getFileNames(j7files);
Map<String, File> j8names = getFileNames(j8files);
j7files.forEach(j7file -> {
if (!j8names.containsKey(j7file.getName())) {
removed.add(j7file);
} else {
queue.add(new Pair<File, File>(j7file, j8names
.get(j7file.getName())));
}
});
j8files.forEach(j8file -> {
if (!j7names.containsKey(j8file.getName())) {
add.add(j8file);
}
});
}
}
// 排序，匿名类型对象似乎无法传递
add.sort((a, b) -> {
if (a.getName().endsWith(".java")) {
if (b.getName().endsWith(".java")) {
return 0;
}
return 1;
}
if (b.getName().endsWith(".java")) {
return -1;
}
return 0;
});
removed.sort((a, b) -> {
if (a.getName().endsWith(".java")) {
if (b.getName().endsWith(".java")) {
return 0;
}
return 1;
}
if (b.getName().endsWith(".java")) {
return -1;
}
return 0;
});
// 写文件
File addFiles = new File("D:\\tmp\\add.txt");
File removeFiles = new File("D:\\tmp\\remove.txt");
if (addFiles.exists()) {
addFiles.delete();
}
if (removeFiles.exists()) {
removeFiles.delete();
}
FileWriter aw = new FileWriter(addFiles);
FileWriter rw = new FileWriter(removeFiles);
// 不需要加final修饰符，可能是编译器处理
int la = "D:\\tmp\\java8\\".length();
add.forEach(file -> {
try {
aw.write(file.getCanonicalPath().substring(la)
.replace(‘\\‘, ‘.‘)
+ "\n");
} catch (Exception e) {
e.printStackTrace();
}
});
int lr = "D:\\tmp\\java7\\".length();
removed.forEach(file -> {
try {
rw.write(file.getCanonicalPath().substring(lr)
.replace(‘\\‘, ‘.‘)
+ "\n");
} catch (Exception e) {
e.printStackTrace();
}
});
aw.close();
rw.close();
}
private static Map<String, File> getFileNames(List<File> files) {
Map<String, File> map = new WeakHashMap<>();
files.forEach(file -> {
map.put(file.getName(), file);
});
return map;
}
static class Pair<T, R> {
private T t;
private R r;
public Pair(T t, R r) {
this.t = t;
this.r = r;
}
public T getFirst() {
return t;
}
public void setFrist(T t) {
this.t = t;
}
public R getSecond() {
return r;
}
public void setSecond(R r) {
this.r = r;
}
}
}
原文：http://blog.csdn.net/u012500127/article/details/23392219
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