比较 Java 中的两个字符串未给出预期结果
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Comparing two string in Java not giving the expected result
提问by A nemati
I am beginner i want to get text in EditTextand compare it with another string .
我是初学者，我想输入文本EditText并将其与另一个字符串进行比较。
I want to check if text writed in EditTextis equals a 'String' then show a Toastbut it is not working
我想检查写入的文本EditText是否等于“字符串”然后显示一个Toast但它不起作用
I debug and check the value of both are exactly admin but if block is not working and shows else block.
我调试并检查两者的值都是 admin 但如果块不起作用并显示 else 块。
if (editText.getText().toString() == "admin") {
//Never enter this block when i type "admin" in the EditText.
Toast.makeText(MainActivity.this,"ok",Toast.LENGTH_LONG).show();
} else {
Toast.makeText(MainActivity.this,"Wrong User Or Pass",
}
采纳答案by Emil
You have to use String.equals()method for string matching.
您必须使用String.equals()方法进行字符串匹配。
Change your code into this
把你的代码改成这个
if (editText.getText().toString().equals("admin")) {
//your code
}
.
.
回答by N Jay
do not use == to compare strings since strings are not primitive data types instead use user.equals("admin")
不要使用 == 来比较字符串，因为字符串不是原始数据类型，而是使用 user.equals("admin")
回答by Shoeb Siddique
You can user equalsIgnoreCase.
您可以使用 equalsIgnoreCase.
This method compares this String to another String, ignoring case considerations. Two strings are considered equal ignoring case if they are of the same length, and corresponding characters in the two strings are equal ignoring case.
此方法将此 String 与另一个 String 进行比较，忽略大小写考虑。如果两个字符串的长度相同，则认为它们是相等的忽略大小写，并且两个字符串中对应的字符是相等的忽略大小写。
btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (user.equalsIgnoreCase("admin")) {
Toast.makeText(MainActivity.this,"ok",Toast.LENGTH_LONG).show();
}
else {
Toast.makeText(MainActivity.this,"Wrong User Or Pass",Toast.LENGTH_LONG).show();
Toast.makeText(MainActivity.this,user,Toast.LENGTH_LONG).show();
}
});
回答by Koray
When i use this way i solved my problem.
当我使用这种方式时，我解决了我的问题。
boolean result = String1.equals(String2);
if (result)
{
return true;
}
else
{
return false;
}
