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‎source/ch3_javadatatypes.ptx‎

Lines changed: 13 additions & 24 deletions
Original file line numberDiff line numberDiff line change
@@ -1080,57 +1080,46 @@ public class HistoMap {
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Improve <xref ref="java-word-count" text="type-global"/> to remove the punctuation.
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</p>
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<exercise label="java_map_parsons_example">
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<exercise label="java_map_parsons_example">
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<statement>
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<p>
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Rearrange and indent the blocks to create a Java method that accepts a dictionary (Map) of item prices and updates the price of a specific item.
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Rearrange and indent the blocks to create a general Java method that accepts a dictionary (Map) of item prices and updates the price of a specific item. If the item does not exist, do nothing.
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</p>
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</statement>
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<blocks>
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<block order="1">
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<choice correct="yes">
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<code language="java">
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public void updatePrice(Map&lt;String, Double&gt; catalog, String item, double newPrice) {
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</code>
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<cline>public void updatePrice(Map&lt;String, Double&gt; catalog, String item, double newPrice) {</cline>
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</choice>
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<choice correct="no">
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<code language="java">
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public void updatePrice(Map&lt;String, Double&gt; catalog, item, newPrice) {
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</code>
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<cline>public void updatePrice() {</cline>
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<cline> Map&lt;String, Double&gt; catalog,</cline>
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<cline> String item,</cline>
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<cline> double newPrice</cline>
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</choice>
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</block>
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<block order="2">
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<choice correct="yes">
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<code language="java">
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if (catalog.containsKey(item)) {
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</code>
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<cline> if (catalog.containsKey(item)) {</cline>
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</choice>
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<choice correct="no">
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<code language="java">
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if (catalog.get(item) == null) {
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</code>
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<cline> if (catalog.get(item) == null) {</cline>
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</choice>
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</block>
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<block order="3">
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<choice correct="yes">
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<code language="java">
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catalog.put(item, newPrice);
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</code>
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<cline> catalog.put(item, newPrice);</cline>
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</choice>
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<choice correct="no">
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<code language="java">
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catalog.add(item, newPrice);
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</code>
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<cline> catalog.add(item, newPrice);</cline>
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</choice>
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</block>
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<block order="4">
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<code language="java">
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}
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}
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</code>
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<cline> }</cline>
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<cline>}</cline>
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</block>
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</blocks>
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</exercise>

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