Examples of java.util.BitSet.previousSetBit()

java.util.BitSet.previousSetBit()
ate on index i here }} @param fromIndex the index to start checking from (inclusive) @return the index of the previous set bit, or {@code -1} if thereis no such bit @throws IndexOutOfBoundsException if the specified index is lessthan {@code -1} @since 1.7

        BitSet bs = new BitSet();
        bs.set(2, 10);
        bs.set(16, 19);
        bs.set(31, 64);
        bs.set(96, 98);
        assertEquals(97, bs.previousSetBit(100));
        assertEquals(97, bs.previousSetBit(97));
        assertEquals(96, bs.previousSetBit(96));
        assertEquals(63, bs.previousSetBit(95));
        assertEquals(63, bs.previousSetBit(63));
        assertEquals(62, bs.previousSetBit(62));

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        bs.set(2, 10);
        bs.set(16, 19);
        bs.set(31, 64);
        bs.set(96, 98);
        assertEquals(97, bs.previousSetBit(100));
        assertEquals(97, bs.previousSetBit(97));
        assertEquals(96, bs.previousSetBit(96));
        assertEquals(63, bs.previousSetBit(95));
        assertEquals(63, bs.previousSetBit(63));
        assertEquals(62, bs.previousSetBit(62));
        assertEquals(32, bs.previousSetBit(32));

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        bs.set(16, 19);
        bs.set(31, 64);
        bs.set(96, 98);
        assertEquals(97, bs.previousSetBit(100));
        assertEquals(97, bs.previousSetBit(97));
        assertEquals(96, bs.previousSetBit(96));
        assertEquals(63, bs.previousSetBit(95));
        assertEquals(63, bs.previousSetBit(63));
        assertEquals(62, bs.previousSetBit(62));
        assertEquals(32, bs.previousSetBit(32));
        assertEquals(31, bs.previousSetBit(31));

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        bs.set(31, 64);
        bs.set(96, 98);
        assertEquals(97, bs.previousSetBit(100));
        assertEquals(97, bs.previousSetBit(97));
        assertEquals(96, bs.previousSetBit(96));
        assertEquals(63, bs.previousSetBit(95));
        assertEquals(63, bs.previousSetBit(63));
        assertEquals(62, bs.previousSetBit(62));
        assertEquals(32, bs.previousSetBit(32));
        assertEquals(31, bs.previousSetBit(31));
        assertEquals(18, bs.previousSetBit(30));

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        bs.set(96, 98);
        assertEquals(97, bs.previousSetBit(100));
        assertEquals(97, bs.previousSetBit(97));
        assertEquals(96, bs.previousSetBit(96));
        assertEquals(63, bs.previousSetBit(95));
        assertEquals(63, bs.previousSetBit(63));
        assertEquals(62, bs.previousSetBit(62));
        assertEquals(32, bs.previousSetBit(32));
        assertEquals(31, bs.previousSetBit(31));
        assertEquals(18, bs.previousSetBit(30));
        assertEquals(18, bs.previousSetBit(18));

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        assertEquals(97, bs.previousSetBit(100));
        assertEquals(97, bs.previousSetBit(97));
        assertEquals(96, bs.previousSetBit(96));
        assertEquals(63, bs.previousSetBit(95));
        assertEquals(63, bs.previousSetBit(63));
        assertEquals(62, bs.previousSetBit(62));
        assertEquals(32, bs.previousSetBit(32));
        assertEquals(31, bs.previousSetBit(31));
        assertEquals(18, bs.previousSetBit(30));
        assertEquals(18, bs.previousSetBit(18));
        assertEquals(17, bs.previousSetBit(17));

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        assertEquals(97, bs.previousSetBit(97));
        assertEquals(96, bs.previousSetBit(96));
        assertEquals(63, bs.previousSetBit(95));
        assertEquals(63, bs.previousSetBit(63));
        assertEquals(62, bs.previousSetBit(62));
        assertEquals(32, bs.previousSetBit(32));
        assertEquals(31, bs.previousSetBit(31));
        assertEquals(18, bs.previousSetBit(30));
        assertEquals(18, bs.previousSetBit(18));
        assertEquals(17, bs.previousSetBit(17));
        assertEquals(16, bs.previousSetBit(16));

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        assertEquals(96, bs.previousSetBit(96));
        assertEquals(63, bs.previousSetBit(95));
        assertEquals(63, bs.previousSetBit(63));
        assertEquals(62, bs.previousSetBit(62));
        assertEquals(32, bs.previousSetBit(32));
        assertEquals(31, bs.previousSetBit(31));
        assertEquals(18, bs.previousSetBit(30));
        assertEquals(18, bs.previousSetBit(18));
        assertEquals(17, bs.previousSetBit(17));
        assertEquals(16, bs.previousSetBit(16));
        assertEquals(9, bs.previousSetBit(15));

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        assertEquals(63, bs.previousSetBit(95));
        assertEquals(63, bs.previousSetBit(63));
        assertEquals(62, bs.previousSetBit(62));
        assertEquals(32, bs.previousSetBit(32));
        assertEquals(31, bs.previousSetBit(31));
        assertEquals(18, bs.previousSetBit(30));
        assertEquals(18, bs.previousSetBit(18));
        assertEquals(17, bs.previousSetBit(17));
        assertEquals(16, bs.previousSetBit(16));
        assertEquals(9, bs.previousSetBit(15));
        assertEquals(9, bs.previousSetBit(9));

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        assertEquals(63, bs.previousSetBit(63));
        assertEquals(62, bs.previousSetBit(62));
        assertEquals(32, bs.previousSetBit(32));
        assertEquals(31, bs.previousSetBit(31));
        assertEquals(18, bs.previousSetBit(30));
        assertEquals(18, bs.previousSetBit(18));
        assertEquals(17, bs.previousSetBit(17));
        assertEquals(16, bs.previousSetBit(16));
        assertEquals(9, bs.previousSetBit(15));
        assertEquals(9, bs.previousSetBit(9));
        assertEquals(2, bs.previousSetBit(2));

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