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Java 细节

Last updated Jun 16, 2023

Java

# List<> 和 []

String[] 是数组，定长，不可变
List<String> 是泛型，非定长，可变

# 极限值

Integer.MAX_VALUE = 2147483647 Double.NEGATIVE_INFINITIVy Double.NaN

# 剩余参数

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  private void check(double a, double b, double c, double... expectedResult) {
    List<Double> zeros = solver.getZeros(a, b, c);
    double[] arr = zeros == null ? null : zeros.stream().mapToDouble(d -> d).toArray();
    assertArrayEquals(arr, expectedResult, DELTA);
  }