equal 比较的是值，两值相等就返回true，== 就不一样了，比较的是地址，即便你定义的两个 Integer 的值是一样的， == 返回的也还是false。 你可以看下Integer 类的源码，有个内部静态类IntegerCache大家先看一个示例：publicstaticvoidmain(String[]args){Integera=127;I
* that is, for any non-null reference values {@code x} and * {@code y}, this method returns {@code true} if and only * if {@code x} and {@code y} refer to the same object * ({@code x == y} has the value {@code true}). * * Note that it is generally necessary to...
str2 is equal to str1 = false str2 is equal to str3 = true String类中Equals方法和Object类中的Equals方法有什么不同 没什么不同。。。所有类都是object的子类。。。String的equals是重写的父类的 J**A中的equal方法的格式和用法 java中的是equals,没有equal,equals比较的是内容,只要值相同就是true。
* that equal objects must have equal hash codes. * *@paramobj the reference object with which to compare. *@return{@codetrue} if this object is the same as the obj * argument; {@codefalse} otherwise. *@see#hashCode() *@seejava.util.HashMap*/publicbooleanequals(Object obj) {return(t...
java.lang.String /** * Compares this string to the specified object. The result is {@code * true} if and only if the argument is not {@code null} and is a {@code * String} object that represents the same sequence of characters as this ...
* if {@code x} and {@code y} refer to the same object * ({@code x == y} has the value {@code true}). * * Note that it is generally necessary to override the {@code hashCode} * method whenever this method is overridden, so as to maintain the * general...
* @return {@code true} if and only if the specified {@code Object} is a * {@code BigDecimal} whose value and scale are equal to this * {@code BigDecimal}'s. * @see #compareTo(java.math.BigDecimal) * @see #hashCode */ @Override public boolean equals(Object x) { if (!(x ...
In other words, one object can not unilaterally decide whether it is equal to another object; two objects, and consequently the classes to which they belong, must bilaterally decide if they are equal or not. They BOTH must agree. Hence, it is improper and incorrect to have your own class...
ComparesthisBigDecimalwiththe specified Objectforequality.Unlike compareTo,thismethod considers two BigDecimal objects equal onlyifthey are equalinvalue andscale(thus2.0is not equal to2.00when compared bythismethod) 大概意思就是,equals方法和compareTo并不一样,equals方法会比较两部分内容,分别是值(value)和...
In this article, we will understand how to differentiate == operator and equals() method in Java. The == (equal to) operator checks if the values of two operands are equal or not, if yes then the condition becomes true. The equals() method compares this string to the specified object....