How to catch code that causes compilation error "uses unchecked or unsafe operations."?

Question

Java

Looks like the code hasn't changed. When compiling, the studio began to give an error:
MyKoteGame.java: uses unchecked or unsafe operations. Recompile with -Xlint:unchecked for details.
Not pointing to the error line. There is a lot of code, how to catch, where does the error come from?

Answer 1

Open build.gradle, find the allprojects section, add to it

allprojects {
    ...

    gradle.projectsEvaluated {
        tasks.withType(JavaCompile) {
            options.compilerArgs << "-Xlint:unchecked"
        }
    }   
}

and try building the project again. You will be directed to the lines.

Answer 2

Read the error carefully.
Set this flag and you will have more details.
Most likely you are using collections somewhere without specifying the exact type