Java番石榴 | Booleans.indexOf(boolean[] array, boolean[] target) 方法和示例
Guava 的 Booleans 类的Booleans.indexOf(boolean[] array, boolean[] target)方法接受两个参数array和target 。如果目标存在于数组中,则该方法返回其第一次出现的开始位置。如果数组中不存在目标,则该方法返回-1 。
句法:
public static int indexOf(boolean[] array,
boolean[] target)
参数:该方法接受两个参数:
- 数组:用于搜索序列目标的数组。
- target:作为数组子序列搜索的数组。
返回值:方法返回:
- 如果目标存在于数组中,则目标第一次出现的起始位置。
- -1 如果目标不存在于数组中。
异常:该方法不抛出任何异常。
下面的例子说明了上述方法的实现:
示例 1:
// Java code to show implementation of
// Guava's Booleans.indexOf(boolean[] array,
// boolean[] target) method
import com.google.common.primitives.Booleans;
import java.util.Arrays;
class GFG {
// Driver's code
public static void main(String[] args)
{
// Creating a boolean array
boolean[] arr = { false, true, false,
false, true };
boolean[] target = { false, false };
// Using indexOf(boolean[] array, boolean[] target)
// method to get the start position of the first
// occurrence of the specified target within array,
// or -1 if there is no such occurrence.
int index = Booleans.indexOf(arr, target);
if (index != -1) {
System.out.println("Target is present at index "
+ index);
}
else {
System.out.println("Target is not present "
+ "in the array");
}
}
}
示例 2:
// Java code to show implementation of
// Guava's Booleans.indexOf(boolean[] array,
// boolean[] target) method
import com.google.common.primitives.Booleans;
import java.util.Arrays;
class GFG {
// Driver's code
public static void main(String[] args)
{
// Creating a boolean array
boolean[] arr = { false, true, false,
false, true };
boolean[] target = { false, false, false };
// Using indexOf(boolean[] array, boolean[] target)
// method to get the start position of the first
// occurrence of the specified target within array,
// or -1 if there is no such occurrence.
int index = Booleans.indexOf(arr, target);
if (index != -1) {
System.out.println("Target is present at index "
+ index);
}
else {
System.out.println("Target is not present "
+ "in the array");
}
}
}
参考: https://google.github.io/guava/releases/20.0/api/docs/com/google/common/primitives/Booleans.html#indexOf-boolean:A-boolean:A-