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public boolean contentEquals(StringBuffer sb)

public class Test {
    public static void main(String args[]) {
        String str1 = "String1";
        String str2 = "String2";
        StringBuffer str3 = new StringBuffer("String1");

        boolean result = str1.contentEquals(str3);
        System.out.println(result);

        result = str2.contentEquals(str3);
        System.out.println(result);
    }
}

true
false