java 基礎類型

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String:

public final class String    implements java.io.Serializable, Comparable<String>, CharSequence {    /** The value is used for character storage. */    private final char value[];    /** Cache the hash code for the string */    private int hash; // Default to 0    /** use serialVersionUID from JDK 1.0.2 for interoperability */    private static final long serialVersionUID = -6849794470754667710L;    ...   }

 StringBuffer:

 public final class StringBuffer    extends AbstractStringBuilder    implements java.io.Serializable, CharSequence{    @Override    public synchronized StringBuffer append(Object obj) {        toStringCache = null;        super.append(String.valueOf(obj));        return this;    }}

StringBuilder:

public final class StringBuilder    extends AbstractStringBuilder    implements java.io.Serializable, CharSequence{　@Override    public StringBuilder append(Object obj) {      return append(String.valueOf(obj));   }}

 

java 基礎類型