集合操作工具类CollectionUtils
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使用CollectionUtils中四个方法之一执行集合操作.这四种分别是union(),intersection();disjunction(); subtract();
下列例子就是演示了如何使用上述四个方法处理两个Collection;
例子:使用:CollectionUtils union(),intersection();disjunction(); subtract();
注: 这些方法都是数学的集合算法
The previous example performs these four operations on two List objects, a and b, printing the results with ArrayUtils.toString( ):
结果:
A: {1,2,2,2,3,3,4,5}
B: {3,4,4,5,6,7}
Union: {1,2,2,2,3,3,4,4,5,6,7}
Intersection: {3,4,5}
Disjunction: {1,2,2,2,3,4,6,7}
Subtract: {1,2,2,2,3}
例子:使用:CollectionUtils union(),intersection();disjunction(); subtract();
注: 这些方法都是数学的集合算法
- import java.util.*;
- String[] arrayA = new String[] { "1", "2", "3", "3", "4", "5" };
- String[] arrayB = new String[] { "3", "4", "4", "5", "6", "7" };
- List a = Arrays.asList( arrayA );
- List b = Arrays.asList( arrayB );
- Collection union = CollectionUtils.union( a, b ); //并集
- Collection intersection = CollectionUtils.intersection( a, b ); //交集
- Collection disjunction = CollectionUtils.disjunction( a, b ); //析取
- Collection subtract = CollectionUtils.subtract( a, b ); //差集
- Collections.sort( union );
- Collections.sort( intersection );
- Collections.sort( disjunction );
- Collections.sort( subtract );
- System.out.println( "A: " + ArrayUtils.toString( a.toArray( ) ) );
- System.out.println( "B: " + ArrayUtils.toString( b.toArray( ) ) );
- System.out.println( "Union: " + ArrayUtils.toString( union.toArray( ) ) );
- System.out.println( "Intersection: " +
- ArrayUtils.toString( intersection.toArray( ) ) );
- System.out.println( "Disjunction: " +
- ArrayUtils.toString( disjunction.toArray( ) ) );
- System.out.println( "Subtract: " + ArrayUtils.toString( subtract.toArray( ) ) );
The previous example performs these four operations on two List objects, a and b, printing the results with ArrayUtils.toString( ):
结果:
A: {1,2,2,2,3,3,4,5}
B: {3,4,4,5,6,7}
Union: {1,2,2,2,3,3,4,4,5,6,7}
Intersection: {3,4,5}
Disjunction: {1,2,2,2,3,4,6,7}
Subtract: {1,2,2,2,3}
el里面的变量转换成java代码 | java线程池的使用
- 2011-01-13 11:20
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- 分类:编程语言
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- @Test
- //@Ignore
- public void test2(){
- String[] arrayA = new String[] { "1", "2", "3", "3", "4", "5" };
- String[] arrayB = new String[] { "3", "4", "4", "5", "6", "7" };
- List a = Arrays.asList(arrayA);
- List b = Arrays.asList( arrayB );
- List union = new ArrayList(CollectionUtils.union(a, b)); //并集
- List intersection = new ArrayList(CollectionUtils.intersection( a, b )); //交集
- List disjunction = new ArrayList(CollectionUtils.disjunction( a, b )); //析取
- List subtract = new ArrayList(CollectionUtils.subtract( a, b )); //差集
- Collections.sort(union);
- Collections.sort( intersection );
- Collections.sort( disjunction );
- Collections.sort( subtract );
- System.out.println( "A: " + a.toString() );
- System.out.println( "B: " + b.toString() );
- System.out.println( "Union: " + union.toString());
- System.out.println( "Intersection: " +
- intersection.toString() );
- System.out.println( "Disjunction: " +
- disjunction.toString() );
- System.out.println( "Subtract: " + subtract.toString() );
- }
=>
A: [1, 2, 3, 3, 4, 5]
B: [3, 4, 4, 5, 6, 7]
Union: [1, 2, 3, 3, 4, 4, 5, 6, 7]
Intersection: [3, 4, 5]
Disjunction: [1, 2, 3, 4, 6, 7]
Subtract: [1, 2, 3]
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