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7 files changed

+138
-135
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‎lang/Saving Space with String Caching/src/main/java/com/javacreed/examples/lang/part1/Example1.java

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* limitations under the License.
2020
* #L%
2121
*/
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package com.javacreed.examples.lang.part1;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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public class Example1 {
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private static final Logger LOGGER = LoggerFactory.getLogger(Example1.class);
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public static void main(final String[] args) {
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final String a = "abcd";
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final String b = "abcd";
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Example1.LOGGER.debug("Same? {}", a == b);
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}
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}
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package com.javacreed.examples.lang.part1;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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public class Example1 {
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private static final Logger LOGGER = LoggerFactory.getLogger(Example1.class);
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public static void main(final String[] args) {
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final String a = "abcd";
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final String b = "abcd";
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Example1.LOGGER.debug("Same? {}", a == b);
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}
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}

‎lang/Saving Space with String Caching/src/main/java/com/javacreed/examples/lang/part1/Example2.java

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* limitations under the License.
2020
* #L%
2121
*/
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package com.javacreed.examples.lang.part1;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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public class Example2 {
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private static final Logger LOGGER = LoggerFactory.getLogger(Example2.class);
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public static void main(final String[] args) {
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final String a = new String("abcd");
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final String b = new String("abcd");
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Example2.LOGGER.debug("Same? {}", a == b);
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}
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}
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package com.javacreed.examples.lang.part1;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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public class Example2 {
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private static final Logger LOGGER = LoggerFactory.getLogger(Example2.class);
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public static void main(final String[] args) {
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final String a = new String("abcd");
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final String b = new String("abcd");
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Example2.LOGGER.debug("Same? {}", a == b);
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}
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}

‎lang/Saving Space with String Caching/src/main/java/com/javacreed/examples/lang/part2/Example3.java

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* limitations under the License.
2020
* #L%
2121
*/
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package com.javacreed.examples.lang.part2;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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public class Example3 {
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private static final Logger LOGGER = LoggerFactory.getLogger(Example3.class);
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public static void main(final String[] args) {
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final String a = new String("abcd");
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final String b = new String("abcd");
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Example3.LOGGER.debug("Same? {}", a == b);
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Example3.LOGGER.debug("Same intern? {}", a.intern() == b.intern());
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}
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}
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package com.javacreed.examples.lang.part2;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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public class Example3 {
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private static final Logger LOGGER = LoggerFactory.getLogger(Example3.class);
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public static void main(final String[] args) {
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final String a = new String("abcd");
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final String b = new String("abcd");
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Example3.LOGGER.debug("Same? {}", a == b);
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Example3.LOGGER.debug("Same intern? {}", a.intern() == b.intern());
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}
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}

‎lang/Saving Space with String Caching/src/main/java/com/javacreed/examples/lang/part3/Example4.java

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* limitations under the License.
2020
* #L%
2121
*/
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package com.javacreed.examples.lang.part3;
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import java.util.ArrayList;
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import java.util.List;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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public class Example4 {
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private static final Logger LOGGER = LoggerFactory.getLogger(Example4.class);
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public static void main(final String[] args) {
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final int limit = 50000000;
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final List<String> data = new ArrayList<>(limit);
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for (int i = 0; i < limit; i++) {
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data.add(new String("Sphinx of black quartz, judge my vow"));
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}
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Example4.LOGGER.debug("Done");
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}
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}
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package com.javacreed.examples.lang.part3;
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import java.util.ArrayList;
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import java.util.List;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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public class Example4 {
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private static final Logger LOGGER = LoggerFactory.getLogger(Example4.class);
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public static void main(final String[] args) {
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final int limit = 50000000;
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final List<String> data = new ArrayList<>(limit);
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for (int i = 0; i < limit; i++) {
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data.add(new String("Sphinx of black quartz, judge my vow"));
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}
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Example4.LOGGER.debug("Done");
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}
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}

‎lang/Saving Space with String Caching/src/main/java/com/javacreed/examples/lang/part3/Example5.java

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* limitations under the License.
2020
* #L%
2121
*/
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package com.javacreed.examples.lang.part3;
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import java.util.ArrayList;
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import java.util.List;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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public class Example5 {
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private static final Logger LOGGER = LoggerFactory.getLogger(Example5.class);
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public static void main(final String[] args) {
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final int limit = 50000000;
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final List<String> data = new ArrayList<>(limit);
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for (int i = 0; i < limit; i++) {
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data.add(new String("Sphinx of black quartz, judge my vow").intern());
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}
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Example5.LOGGER.debug("Done");
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}
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}
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package com.javacreed.examples.lang.part3;
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import java.util.ArrayList;
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import java.util.List;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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public class Example5 {
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private static final Logger LOGGER = LoggerFactory.getLogger(Example5.class);
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public static void main(final String[] args) {
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final int limit = 50000000;
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final List<String> data = new ArrayList<>(limit);
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for (int i = 0; i < limit; i++) {
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data.add(new String("Sphinx of black quartz, judge my vow").intern());
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}
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Example5.LOGGER.debug("Done");
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}
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}

‎lang/Saving Space with String Caching/src/main/java/com/javacreed/examples/lang/part3/Example6.java

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* limitations under the License.
2020
* #L%
2121
*/
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package com.javacreed.examples.lang.part3;
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import java.util.ArrayList;
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import java.util.List;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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public class Example6 {
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private static final Logger LOGGER = LoggerFactory.getLogger(Example6.class);
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public static void main(final String[] args) {
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final StringPool cache = new StringPool();
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final int limit = 50000000;
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final List<String> data = new ArrayList<>(limit);
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for (int i = 0; i < limit; i++) {
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data.add(cache.get(new String("Sphinx of black quartz, judge my vow")));
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}
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Example6.LOGGER.debug("Done");
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}
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}
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package com.javacreed.examples.lang.part3;
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import java.util.ArrayList;
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import java.util.List;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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public class Example6 {
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private static final Logger LOGGER = LoggerFactory.getLogger(Example6.class);
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public static void main(final String[] args) {
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final StringPool cache = new StringPool();
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final int limit = 50000000;
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final List<String> data = new ArrayList<>(limit);
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for (int i = 0; i < limit; i++) {
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data.add(cache.get(new String("Sphinx of black quartz, judge my vow")));
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}
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Example6.LOGGER.debug("Done");
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}
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}

‎lang/Saving Space with String Caching/src/main/java/com/javacreed/examples/lang/part3/StringPool.java

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* limitations under the License.
2020
* #L%
2121
*/
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package com.javacreed.examples.lang.part3;
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import java.util.HashMap;
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import java.util.Map;
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public class StringPool {
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private final Map<String, String> cache = new HashMap<>();
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public String get(final String value) {
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String cachedValue = cache.get(value);
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if (cachedValue == null) {
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cachedValue = value;
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cache.put(value, value);
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}
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return cachedValue;
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}
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}
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package com.javacreed.examples.lang.part3;
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import java.util.HashMap;
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import java.util.Map;
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import net.jcip.annotations.NotThreadSafe;
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@NotThreadSafe
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public class StringPool {
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private final Map<String, String> cache = new HashMap<>();
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public String get(final String value) {
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String cachedValue = cache.get(value);
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if (cachedValue == null) {
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cachedValue = value;
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cache.put(value, value);
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}
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return cachedValue;
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}
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}

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