Java 中的布尔 compareTo()方法，带示例
原文:https://www . geesforgeks . org/boolean-compare to-method-in-Java-with-examples/
布尔类的 compareTo() 方法是 Java 中的一个内置方法，用于将给定的布尔实例与当前实例进行比较。
语法:
BooleanObject.compareTo(Boolean a)
参数:取布尔值 a 作为参数，与当前实例进行比较。
返回类型:功能的返回类型为 int 。它返回:
- 如果“a”等于“b”，则为 0，
- 如果“a”为假，“b”为真，则为负值，
- 如果“a”为真，“b”为假，则为正值。
下面是说明布尔类的 compareTo()方法的程序:
程序 1:
// Java code to implement
// compareTo() method of Boolean class
class GeeksforGeeks {
// Driver method
public static void main(String[] args)
{
// Boolean object
Boolean a = new Boolean(true);
// Boolean object
Boolean b = new Boolean(true);
// compare method
System.out.println(a + " comparing with " + b
+ " = " + a.compareTo(b));
}
}
Output:
true comparing with true = 0
程序 2:
// Java code to implement
// compareTo() method of Java class
class GeeksforGeeks {
// Driver method
public static void main(String[] args)
{
// Boolean object
Boolean a = new Boolean(true);
// Boolean object
Boolean b = new Boolean(false);
// compare method
System.out.println(a + " comparing with " + b
+ " = " + a.compareTo(b));
}
}
Output:
true comparing with false = 1
程序 3:
// Java code to implement
// compareTo() method of Java class
class GeeksforGeeks {
// Driver method
public static void main(String[] args)
{
// Boolean object
Boolean a = new Boolean(false);
// Boolean object
Boolean b = new Boolean(true);
// compare method
System.out.println(a + " comparing with " + b
+ " = " + a.compareTo(b));
}
}
Output:
false comparing with true = -1
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