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- public final class Object1 {
- private String a;
- private String b;
- // constructor getter and setter
- public class Object2 {
- private BigDecimal value1;
- private BigDecimal value2;
- // constructor getter and setter
- Object1{a="15", b="XXX"}, Object2{value1=12.1, value2=32.3}
- Object1{a="15", b="YYY"}, Object2{value1=21.1, value2=24.3}
- Object1{a="16", b="AAA"}, Object2{value1=34.1, value2=45.3}
- Object1{a="15", b="BBB"}, Object2{value1=23.1, value2=65.3}
- Object1{a="15", b="DDD"}, Object2{value1=23.1, value2=67.3}
- Object1{a="17", b="CCC"}, Object2{value1=78.1, value2=2.3}
- ........
- a="15", {{value1=12.1, value2=32.3}, {value1=21.1, value2=24.3}, {value1=23.1, value2=65.3}, {value1=23.1, value2=67.3}},
- a="16", {{value1=34.1, value2=45.3}}
- ...
- Map<String, List<Object2>> map1 = map.entrySet()
- .stream()
- .collect(Collectors.toMap(e -> e.getKey().getA(), list of object with this key);
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