1. Do not take type wording:
1 |
List listWithoutDup = new ArrayList( new HashSet(listWithDup)); |
2. Style with type (for example, String type):
1) Java 7 The following notation:
1 |
List<string> listWithoutDup = new ArrayList<string>( new HashSet<string>(listWithDup));</string></string></string> |
2) Java 7 and above:
1 |
List<string> listWithoutDup = new ArrayList<>( new HashSet<>(listWithDup));</string> |
Examples:
1234567891011121314151617 |
import
java.util.ArrayList;
import
java.util.HashSet;
import
java.util.List;
public
class
Test {
public
static
void main(String[] args) {
List<string> listWithDup =
new
ArrayList<string>();
listWithDup.add(
"1"
);
listWithDup.add(
"2"
);
listWithDup.add(
"3"
);
listWithDup.add(
"1"
);
List<string> listWithoutDup =
new
ArrayList<string>(
new
HashSet<string>(listWithDup));
System.out.println(
"list with dup:"
+ listWithDup);
System.out.println(
"list without dup:"
+ listWithoutDup);
}
}</string></string></string></string></string>
|
Sample Run Results: List with dup:[1, 2, 3, 1]
List without dup:[3, 2, 1]
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