StringBuilder 源代码
StringBuilder.java
001 /**
002 * @(#)StringBuilder.java 1.11 05/11/17
003 *
004 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
005 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
006 */
007
008 package java.lang;
048 *
049 * @author Michael McCloskey
050 * @version 1.11, 11/17/05
051 * @see java.lang.StringBuffer
052 * @see java.lang.String
053 * @since 1.5
054 */
055 public final class StringBuilder
056 extends AbstractStringBuilder
057 implements java.io.Serializable, CharSequence
058 {
059
060 /*** use serialVersionUID for interoperability */
061 static final long serialVersionUID = 4383685877147921099L;
062
067 public StringBuilder() {
068 super(16);
069 }
079 public StringBuilder(int capacity) {
080 super(capacity);
081 }
082
091 public StringBuilder(String str) {
092 super(str.length() + 16);
093 append(str);
094 }
095
105 public StringBuilder(CharSequence seq) {
106 this(seq.length() + 16);
107 append(seq);
108 }
109
114 public StringBuilder append(Object obj) {
115 return append(String.valueOf(obj));
116 }
117
118 public StringBuilder append(String str) {
119 super.append(str);
120 return this;
121 }
122
123 // Appends the specified string builder to this sequence.
124 private StringBuilder append(StringBuilder sb) {
125 if (sb == null)
126 return append("null");
127 int len = sb.length();
128 int newcount = count + len;
129 if (newcount > value.length)
130 expandCapacity(newcount);
131 sb.getChars(0, len, value, count);
132 count = newcount;
133 return this;
134 }
155 public StringBuilder append(StringBuffer sb) {
156 super.append(sb);
157 return this;
158 }
159
163 public StringBuilder append(CharSequence s) {
164 if (s == null)
165 s = "null";
166 if (s instanceof String)
167 return this.append((String)s);
168 if (s instanceof StringBuffer)
169 return this.append((StringBuffer)s);
170 if (s instanceof StringBuilder)
171 return this.append((StringBuilder)s);
172 return this.append(s, 0, s.length());
173 }
174
178 public StringBuilder append(CharSequence s, int start, int end) {
179 super.append(s, start, end);
180 return this;
181 }
182
183 public StringBuilder append(char str[]) {
184 super.append(str);
185 return this;
186 }
187
188 public StringBuilder append(char str[], int offset, int len) {
189 super.append(str, offset, len);
190 return this;
191 }
192
197 public StringBuilder append(boolean b) {
198 super.append(b);
199 return this;
200 }
201
202 public StringBuilder append(char c) {
203 super.append(c);
204 return this;
205 }
206
211 public StringBuilder append(int i) {
212 super.append(i);
213 return this;
214 }
215
220 public StringBuilder append(long lng) {
221 super.append(lng);
222 return this;
223 }
224
229 public StringBuilder append(float f) {
230 super.append(f);
231 return this;
232 }
233
238 public StringBuilder append(double d) {
239 super.append(d);
240 return this;
241 }
242
246 public StringBuilder appendCodePoint(int codePoint) {
247 super.appendCodePoint(codePoint);
248 return this;
249 }
250
254 public StringBuilder delete(int start, int end) {
255 super.delete(start, end);
256 return this;
257 }
258
262 public StringBuilder deleteCharAt(int index) {
263 super.deleteCharAt(index);
264 return this;
265 }
266
270 public StringBuilder replace(int start, int end, String str) {
271 super.replace(start, end, str);
272 return this;
273 }
274
278 public StringBuilder insert(int index, char str[], int offset,
279 int len)
280 {
281 super.insert(index, str, offset, len);
282 return this;
283 }
284
291 public StringBuilder insert(int offset, Object obj) {
292 return insert(offset, String.valueOf(obj));
293 }
299 public StringBuilder insert(int offset, String str) {
300 super.insert(offset, str);
301 return this;
302 }
303
307 public StringBuilder insert(int offset, char str[]) {
308 super.insert(offset, str);
309 return this;
310 }
311
315 public StringBuilder insert(int dstOffset, CharSequence s) {
316 if (s == null)
317 s = "null";
318 if (s instanceof String)
319 return this.insert(dstOffset, (String)s);
320 return this.insert(dstOffset, s, 0, s.length());
321 }
322
326 public StringBuilder insert(int dstOffset, CharSequence s,
327 int start, int end)
328 {
329 super.insert(dstOffset, s, start, end);
330 return this;
331 }
332
339 public StringBuilder insert(int offset, boolean b) {
340 super.insert(offset, b);
341 return this;
342 }
343
348 public StringBuilder insert(int offset, char c) {
349 super.insert(offset, c);
350 return this;
351 }
352
359 public StringBuilder insert(int offset, int i) {
360 return insert(offset, String.valueOf(i));
361 }
362
369 public StringBuilder insert(int offset, long l) {
370 return insert(offset, String.valueOf(l));
371 }
372
379 public StringBuilder insert(int offset, float f) {
380 return insert(offset, String.valueOf(f));
381 }
382
389 public StringBuilder insert(int offset, double d) {
390 return insert(offset, String.valueOf(d));
391 }
392
396 public int indexOf(String str) {
397 return indexOf(str, 0);
398 }
399
403 public int indexOf(String str, int fromIndex) {
404 return String.indexOf(value, 0, count,
405 str.toCharArray(), 0, str.length(), fromIndex);
406 }
407
411 public int lastIndexOf(String str) {
412 return lastIndexOf(str, count);
413 }
414
418 public int lastIndexOf(String str, int fromIndex) {
419 return String.lastIndexOf(value, 0, count,
420 str.toCharArray(), 0, str.length(), fromIndex);
421 }
422
423 public StringBuilder reverse() {
424 super.reverse();
425 return this;
426 }
427
428 public String toString() {
429 // Create a copy, don't share the array
430 return new String(value, 0, count);
431 }
432
444 private void writeObject(java.io.ObjectOutputStream s)
445 throws java.io.IOException {
446 s.defaultWriteObject();
447 s.writeInt(count);
448 s.writeObject(value);
449 }
450
455 private void readObject(java.io.ObjectInputStream s)
456 throws java.io.IOException, ClassNotFoundException {
457 s.defaultReadObject();
458 count = s.readInt();
459 value = (char[]) s.readObject();
460 }
461
462 }