Java List with all combinations of 8 booleans

发布于03月20日

假设我传入了3个True和5个False，我如何编写getAllCombos方法以返回一个包含以下内容的列表:

一个1SampleForSO的物体， Select 了3个
三个"三选二"组合
三个"三选一"组合
未 Select 的1,SampleForSO个对象

所以我会返回一个List，其中包含:

SampleForSO(T，T，T，F，F，F)
SampleForSO(T，T，F，F，F，F)
SampleForSO(T，F，T，F，F，F)
SampleForSO(F，T，T，F，F，F)
SampleForSO(T，T，F，F，F，F)
SampleForSO(F，T，T，F，F，F)
SampleForSO(T，F，T，F，F，F)
SampleForSO(F，F)

public class SampleForSO {

private boolean b0;
private boolean b1;
private boolean b2;
private boolean b3;
private boolean b4;
private boolean b5;
private boolean b6;
private boolean b7;

public SampleForSO(boolean b0, boolean b1, boolean b2, boolean b3, boolean b4, boolean b5, boolean b6, boolean b7) {
    this.b0 = b0;
    this.b1 = b1;
    this.b2 = b2;
    this.b3 = b3;
    this.b4 = b4;
    this.b5 = b5;
    this.b6 = b6;
    this.b7 = b7;
}

public boolean equals(Object o) {
    if(o instanceof SampleForSO) {
        SampleForSO outer = (SampleForSO) o;
        return outer.b0 == this.b0 && outer.b1 == this.b1 && outer.b2 == this.b2 && outer.b3 == this.b3 && outer.b4 == this.b4 && outer.b5 == this.b5 && outer.b6 == this.b6 && outer.b7 == this.b7;
    }
    return false;
    
}

public static List<SampleForSO> getAllCombos(boolean b0, boolean b1, boolean b2, boolean b3, boolean b4, boolean b5, boolean b6, boolean b7){
    // How to get all the combos?
    return new ArrayList<SampleForSO>();
}

}

Here's a JUnit test that would show green if that method worked:

public class SampleForSOTest {

    public SampleForSOTest() {
        super();
    }
    
    @Test
    public void testGetAllCombinations() throws Exception {
        
        // 3 true, 5 false, but need this to work for all possibilities
        boolean b0_ = true;
        boolean b1_ = true;
        boolean b2_ = true;
        boolean b3_ = false;
        boolean b4_ = false;
        boolean b5_ = false;
        boolean b6_ = false;
        boolean b7_ = false;

        int numCombosWithAllThree = 1;
        int numCombosWithTwo = 3;
        int numCombosWithOne = 3;
        int numCombosWithZero = 1;

        int expectedSize = numCombosWithAllThree + numCombosWithTwo + numCombosWithOne + numCombosWithZero;
        
        List<SampleForSO> allCombos = SampleForSO.getAllCombos(b0_, b1_, b2_, b3_, b4_, b5_, b6_, b7_);

        assertEquals(expectedSize, allCombos.size());
    }

    

}

我想要的组合是:

b0，b1，b2全部为真，其余全部为假
b0 b1 true，all other false
b1 b2 true，all other false
B2b0为真，其他均为假
b0 true，all other false
B1是真的，其他都是假的
B2为真，其他均为假
所有假

import java.util.ArrayList; import java.util.Arrays; import java.util.List; public class Main { public static List<List<Boolean>> generateAllCombinations(List<Boolean> input) { var combinations = new ArrayList<List<Boolean>>(); if (input.isEmpty()) { return combinations; } // add combination seed combinations.add(new ArrayList<>()); for (var inputIndexValue : input) { var nextCombinations= new ArrayList<List<Boolean>>(); for (var indexCombination : combinations) { if (inputIndexValue) { // true is only valid if inputIndexValue is true var newCombination = new ArrayList<>(indexCombination); newCombination.add(true); nextCombinations.add(newCombination); } // false is always a valid value var newCombination = new ArrayList<>(indexCombination); newCombination.add(false); nextCombinations.add(newCombination); } combinations = nextCombinations; } return combinations; } public static void main(String[] args) { var input = List.of(true, true, true, false, false, false, false, false); var allCombinations = generateAllCombinations(input); for (var combination : allCombinations) { System.out.println(combination); } } }

Java List with all combinations of 8 booleans

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