Android String Equality: equals() vs equalsIgnoreCase()

In Android, to determine if two strings are equal, you can use the equals() method or the equalsIgnoreCase() method.

1. Utilize the equals() method to compare two strings for equality, taking into account case sensitivity.

String str1 = "hello";
String str2 = "world";

if(str1.equals(str2)){
    // 字符串相等
}else{
    // 字符串不相等
}

1. The equalsIgnoreCase() method is used to compare two strings for equality while ignoring the case.

String str1 = "Hello";
String str2 = "hello";

if(str1.equalsIgnoreCase(str2)){
    // 字符串相等
}else{
    // 字符串不相等
}

It is important to note that when comparing empty strings or null values, it is best to first check for null to avoid a NullPointerException.

String str1 = "hello";
String str2 = null;

if(str1 != null && str1.equals(str2)){
    // 字符串相等
}else{
    // 字符串不相等
}