Try Math.max like below:

return Math.max(Math.max(a, b), Math.max(c, d));

Java 7 documentation:

Returns the smaller of two int values. That is, the result the argument closer to the value of Integer.MIN_VALUE. If the arguments have the same value, the result is that same value.

Behaviour:

Math.min(1, 2) => 1
Math.min(1F, 2) => 1F
Math.min(3D, 2F) => 2D
Math.min(-0F, 0F) => -0F
Math.min(0D, -0D) => -0D
Math.min(Float.NaN, -2) => Float.NaN
Math.min(-2F, Double.NaN) => Double.NaN

java.lang.Math and java.lang.StrictMath Source:

public static int min(int a, int b) {
    return (a <= b) ? a : b;
}

java.lang.Math Bytecode (javap -c Math.class of Oracle's JDK's JRE's rt.jar):

public static int min(int, int);
Code:
   0: iload_0           // loads a onto the stack
   1: iload_1           // loads b onto the stack
   2: if_icmpgt     9   // pops two ints (a, b) from the stack
                        // and compares them
                        // if b>a, the jvm continues at label 9
                        // else, at the next instruction, 5
                        // icmpgt is for integer-compare-greater-than
   5: iload_0           // loads a onto the stack
   6: goto          10  // jumps to label 10
   9: iload_1           // loads 
  10: ireturn           // returns the currently loaded integer

If the comparison at 5 is true, a will be loaded, the jvm will jump to 10 and return a, if the comparison yields false, it will jump to 9, which will load and return b.

Intrinsics:

This .hpp file of the Java 8 Hotspot JVM hints that it optimizes Math.min even further with optimized machine code:

do_intrinsic(_min, java_lang_Math, min_name, int2_int_signature, F_S)

This means the above bytecode won't be executed by the Java 8 Hotspot JVM. However, this differs from JVM to JVM, which is why I also explained the bytecode!

Hopefully, now you know all there is to know about Math.min! :)

I understand this was asked for Java. In Android world, it's common to use Kotlin and Java combined. In case some Kotlin user reached here (just like me), then they can use coerceIn extension function:

Kotlin Code:

println(10.coerceIn(1, 100)) // 10
println(10.coerceIn(1..100)) // 10
println(0.coerceIn(1, 100)) // 1
println(500.coerceIn(1, 100)) // 100

Read more on official Kotlin Documentation.