How to determine whether a string contains a certain character in java

1. contains method

1: Description

java.lang.String.contains() Method returns true if and only if this string contains the specified char value sequence.

2: Statement

public boolean contains(CharSequence s)

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3: Return value

This method returns true if this string contains, false otherwise.

4: Example

public static void main(String[] args) {
        String str = "abc";
        boolean status = str.contains("a");
        if(status){
            System.out.println("包含");
        }else{
            System.out.println("不包含");
        }
    }

2. indexOf method

1: Description

java.lang.String. The purpose of indexOf() is to find the position of a word in a string, and it can also determine whether a string contains a certain character.

2: Statement

int indexOf(int ch,int fromIndex)

3: Return value

The return value of indexOf is int

4: Example

    public static void main(String[] args) {
        String str1 = "abcdefg";
        int result1 = str1.indexOf("a");
        if(result1 != -1){
            System.out.println("字符串str中包含子串“a”"+result1);
        }else{
            System.out.println("字符串str中不包含子串“a”"+result1);
        }
    }

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