Created
April 6, 2017 07:04
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fuck code.
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import java.util.Map; | |
import java.util.HashMap; | |
public class Main { | |
private Map<String, String> map; | |
public Main() { | |
Map<String, String> map = new HashMap<String, String>(); | |
map.put("a", "123"); | |
map.put("b", "d"); | |
map.put("c", "456"); | |
System.out.println(getValueAsInt("a")); | |
System.out.println(getValueAsInt("b")); | |
System.out.println(getValueAsInt("c")); | |
} | |
public int getValueAsInt(String key) { | |
if(map.get(key) == null){ | |
return -1; | |
} else { | |
int res; | |
try{ | |
res = Integer.parseInt(map.get(key)); | |
} catch(NumberFormatException e) { | |
e.printStackTrace(); | |
res = -1; | |
} | |
return res; | |
} | |
} | |
public static void main(String args[]){ | |
new Main(); | |
} | |
} |
import java.util.Arrays;
import java.util.Map;
import java.util.stream.Collectors;
public class Java9 {
private final Map<String, Integer> map = Map.of("a", "123", "b", "d", "c", "456")
.entrySet().stream()
.collect(Collectors.toMap(Map.Entry::getKey, entry -> {
try {
return Integer.parseInt(entry.getValue());
} catch (NumberFormatException e) {
return -1;
}
}));
public int getValueAsInt(String key) {
return map.getOrDefault(key, -1);
}
public static void main(String... args) {
new Java9().print(args);
}
private void print(String... keys) {
Arrays.stream(keys).forEach(key -> System.out.println(getValueAsInt(key)));
}
}
import java.util.Arrays;
import java.util.Map;
// https://gist.github.com/gakuzzzz/9f35617943decf2893ea
import static jp.t2v.lab.syntax.MapStreamSyntax.entryToMap;
import static jp.t2v.lab.syntax.MapStreamSyntax.values;
public class Java9 {
private final Map<String, Integer> map = Map.of("a", "123", "b", "d", "c", "456")
.entrySet().stream()
.map(values(s -> {
try {
return Integer.parseInt(s);
} catch (NumberFormatException e) {
return -1;
}
})).collect(entryToMap());
public int getValueAsInt(String key) {
return map.getOrDefault(key, -1);
}
public static void main(String... args) {
new Java9().print(args);
}
private void print(String... keys) {
// Arrays.stream(keys).forEach(key -> System.out.println(getValueAsInt(key)));
Arrays.stream(keys).mapToInt(this::getValueAsInt).forEach(System.out::println);
}
}
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記念パピコ