Only available in JRE 1.2.2 and higher:
  proguard.classfile.ClassPool: java.util.TreeMap
  proguard.classfile.editor.ConstantPoolSorter: java.util.Arrays
  proguard.classfile.editor.ComparableCpInfo: java.lang.Integer: int compareTo(java.lang.Integer)
  proguard.classfile.editor.ComparableCpInfo: java.lang.Long: int compareTo(java.lang.Long)
  proguard.classfile.editor.ComparableCpInfo: java.lang.Float: int compareTo(java.lang.Float)
  proguard.classfile.editor.ComparableCpInfo: java.lang.Double: int compareTo(java.lang.Double)
  proguard.classfile.editor.ComparableCpInfo: java.lang.Comparable
  proguard.io.DirectoryWriter: java.io.File: java.io.File getParentFile()
  proguard.io.JarWriter: java.util.jar.JarOutputStream
  proguard.io.DirectoryPump: java.io.File: java.io.File[] listFiles()
  proguard.gui.ProGuardGUI: java.awt.Dimension: double getWidth()
  proguard.gui.ProGuardGUI: java.util.Arrays
  proguard.gui.splash.ShadowedSprite: java.awt.Graphics2D
  proguard.gui.splash.ShadowedSprite: java.awt.Color: void <init>(float,float,float,float)
  proguard.gui.splash.ClipSprite: java.awt.Graphics2D
  proguard.gui.splash.OverrideGraphics2D: java.awt.Graphics2D
  proguard.gui.splash.OverrideGraphics2D: java.awt.RenderingHints$Key
  proguard.gui.splash.OverrideGraphics2D: java.awt.RenderingHints
  proguard.gui.splash.VariableSizeFont: java.awt.Font: java.awt.Font deriveFont(float)
Only available in Personal Java JRE 1.1.8 and in JRE 1.2.2 and higher:
  proguard.ClassPath: java.util.ArrayList
  proguard.ClassPath: java.util.List
  proguard.ClassSpecification: java.util.ArrayList
  proguard.ClassSpecification: java.util.List
  proguard.ClassSpecificationVisitorFactory: java.util.List
  proguard.classfile.ClassPool: java.util.HashMap
  proguard.classfile.ClassPool: java.util.Map
  proguard.classfile.ClassPool: java.util.Collection
  proguard.classfile.ClassPool: java.util.Iterator
  proguard.classfile.util.ClassUtil: java.util.List
  proguard.ConfigurationParser: java.util.ArrayList
  proguard.ConfigurationParser: java.util.List
  proguard.ConfigurationWriter: java.util.List
  proguard.io.JarWriter: java.util.HashSet
  proguard.io.JarWriter: java.util.Set
  proguard.ProGuard: java.util.List
  proguard.util.ListUtil: java.util.ArrayList
  proguard.util.ListUtil: java.util.List
  proguard.util.BasicListMatcher: java.util.List
  proguard.util.BasicMatcher: java.util.ArrayList
  proguard.util.BasicMatcher: java.util.List
  proguard.obfuscate.MemberInfoLinker: java.util.HashMap
  proguard.obfuscate.MemberInfoLinker: java.util.Map
  proguard.obfuscate.AttributeUsageMarker: java.util.HashSet
  proguard.obfuscate.AttributeUsageMarker: java.util.List
  proguard.obfuscate.AttributeUsageMarker: java.util.Set
  proguard.obfuscate.ClassFileObfuscator$1: java.util.Set
  proguard.obfuscate.ClassFileObfuscator: java.util.HashMap
  proguard.obfuscate.ClassFileObfuscator: java.util.HashSet
  proguard.obfuscate.ClassFileObfuscator: java.util.Map
  proguard.obfuscate.ClassFileObfuscator: java.util.Set
  proguard.obfuscate.NameFactory: java.util.ArrayList
  proguard.obfuscate.NameFactory: java.util.List
  proguard.obfuscate.MemberInfoObfuscator: java.util.HashMap
  proguard.obfuscate.MemberInfoObfuscator: java.util.HashSet
  proguard.obfuscate.MemberInfoObfuscator: java.util.Map
  proguard.obfuscate.MemberInfoObfuscator: java.util.Collection
  proguard.obfuscate.MemberInfoObfuscator: java.util.Iterator
  proguard.obfuscate.MemberInfoObfuscator: java.util.Set
  proguard.ant.ClassMemberSpecificationElement: java.util.List
  proguard.ant.ClassSpecificationElement: java.util.ArrayList
  proguard.ant.ClassSpecificationElement: java.util.List
  proguard.ant.ConfigurationTask: java.util.ArrayList
  proguard.ant.ConfigurationTask: java.util.List
  proguard.ant.KeepAttributeElement: java.util.List
  proguard.ant.ProGuardTask: java.util.ArrayList
  proguard.gui.ClassMemberSpecificationsPanel: java.util.ArrayList
  proguard.gui.ClassMemberSpecificationsPanel: java.util.List
  proguard.gui.ListPanel: java.util.ArrayList
  proguard.gui.ListPanel: java.util.List
  proguard.gui.ClassSpecificationsPanel: java.util.ArrayList
  proguard.gui.ClassSpecificationsPanel: java.util.List
  proguard.gui.ProGuardGUI: java.util.ArrayList
  proguard.gui.ProGuardGUI: java.util.List
  proguard.retrace.StackTrace: java.util.ArrayList
  proguard.retrace.StackTrace: java.util.List
  proguard.retrace.StackTraceItem: java.util.ArrayList
  proguard.retrace.StackTraceItem: java.util.List
Only available in JRE 1.3.0 and higher:
  proguard.FileWordReader: java.net.URL: java.lang.String getPath()