diff --git a/ffi/java/java.md b/ffi/java/java.md
index b0132ca..0e6d3cb 100644
--- a/ffi/java/java.md
+++ b/ffi/java/java.md
@@ -1,13 +1,14 @@
 # JNI for mcl (experimental)
 This library provides functionality to compute the optimal ate pairing
-over Barreto-Naehrig (BN) curves.
+over Barreto-Naehrig (BN) or BLS12-381 curves.
 
 # Initialization
-Load the library `mcl_bn256`.
+Load the library `mcljava`.
 ```
 import com.herumi.mcl.*;
 
-System.loadLibrary("mcl_bn256");
+System.loadLibrary(System.mapLibraryName("mcljava"));
+Mcl.SystemInit(curveType); // curveType = Mcl.BN254 or Mcl.BLS12_381
 ```
 
 # Classes
@@ -22,74 +23,65 @@ System.loadLibrary("mcl_bn256");
 * `Fr::setInt(int x)` ; set by x
 * `Fr::setStr(String str)` ; set by str such as "123", "0xfff", etc.
 * `Fr::setByCSPRNG()` ; randomly set
-* `Bn256.neg(Fr y, Fr x)` ; `y = -x`
-* `Bn256.add(Fr z, Fr x, Fr y)` ; `z = x + y`
-* `Bn256.sub(Fr z, Fr x, Fr y)` ; `z = x - y`
-* `Bn256.mul(Fr z, Fr x, Fr y)` ; `z = x * y`
-* `Bn256.div(Fr z, Fr x, Fr y)` ; `z = x / y`
+* `Mcl.neg(Fr y, Fr x)` ; `y = -x`
+* `Mcl.add(Fr z, Fr x, Fr y)` ; `z = x + y`
+* `Mcl.sub(Fr z, Fr x, Fr y)` ; `z = x - y`
+* `Mcl.mul(Fr z, Fr x, Fr y)` ; `z = x * y`
+* `Mcl.div(Fr z, Fr x, Fr y)` ; `z = x / y`
 
 ## G1
 
-* `G1::set(String x, String y)` ; set by (x, y)
-* `G1::hashAndMapToG1(String m)` ; take SHA-256 of m and map it to an element of G1
-* `G1::setStr(String str)` ; set by the result of `toString()` method
-* `Bn256.neg(G1 y, G1 x)` ; `y = -x`
-* `Bn256.dbl(G1 y, G1 x)` ; `y = 2x`
-* `Bn256.add(G1 z, G1 x, G1 y)` ; `z = x + y`
-* `Bn256.sub(G1 z, G1 x, G1 y)` ; `z = x - y`
-* `Bn256.mul(G1 z, G1 x, Fr y)` ; `z = x * y`
+* `Mcl.neg(G1 y, G1 x)` ; `y = -x`
+* `Mcl.dbl(G1 y, G1 x)` ; `y = 2x`
+* `Mcl.add(G1 z, G1 x, G1 y)` ; `z = x + y`
+* `Mcl.sub(G1 z, G1 x, G1 y)` ; `z = x - y`
+* `Mcl.mul(G1 z, G1 x, Fr y)` ; `z = x * y`
 
 ## G2
 
-* `G2::set(String xa, String xb, String ya, String yb)` ; set by ((xa, xb), (ya, yb))
-* `G2::setStr(String str)` ; set by the result of `toString()` method
-* `Bn256.neg(G2 y, G2 x)` ; `y = -x`
-* `Bn256.dbl(G2 y, G2 x)` ; `y = 2x`
-* `Bn256.add(G2 z, G2 x, G2 y)` ; `z = x + y`
-* `Bn256.sub(G2 z, G2 x, G2 y)` ; `z = x - y`
-* `Bn256.mul(G2 z, G2 x, Fr y)` ; `z = x * y`
+* `Mcl.neg(G2 y, G2 x)` ; `y = -x`
+* `Mcl.dbl(G2 y, G2 x)` ; `y = 2x`
+* `Mcl.add(G2 z, G2 x, G2 y)` ; `z = x + y`
+* `Mcl.sub(G2 z, G2 x, G2 y)` ; `z = x - y`
+* `Mcl.mul(G2 z, G2 x, Fr y)` ; `z = x * y`
 
 ## GT
 
 * `GT::setStr(String str)` ; set by the result of `toString()` method
-* `Bn256.mul(GT z, GT x, GT y)` ; `z = x * y`
-* `Bn256.pow(GT z, GT x, Fr y)` ; `z = x ^ y`
+* `Mcl.mul(GT z, GT x, GT y)` ; `z = x * y`
+* `Mcl.pow(GT z, GT x, Fr y)` ; `z = x ^ y`
 
 ## pairing
-* `Bn256.pairing(GT e, G1 P, G2 Q)` ; e = e(P, Q)
+* `Mcl.pairing(GT e, G1 P, G2 Q)` ; e = e(P, Q)
 
 # BLS signature sample
 ```
-String xa = "12723517038133731887338407189719511622662176727675373276651903807414909099441";
-String xb = "4168783608814932154536427934509895782246573715297911553964171371032945126671";
-String ya = "13891744915211034074451795021214165905772212241412891944830863846330766296736";
-String yb = "7937318970632701341203597196594272556916396164729705624521405069090520231616";
-
-G2 Q = new G2(xa, xb, ya, yb); // fixed point of G2
+G2 Q = new G2();
+Mcl.hashAndMapToG2(Q, "abc".getBytes());
 
 Fr s = new Fr();
 s.setByCSPRNG(); // secret key
 G2 pub = new G2();
-Bn256.mul(pub, Q, s); // public key = sQ
+Mcl.mul(pub, Q, s); // public key = sQ
 
 String m = "signature test";
 G1 H = new G1();
-H.hashAndMapToG1(m); // H = Hash(m)
+Mcl.hashAndMapToG1(H, m.getBytes()); // H = Hash(m)
 G1 sign = new G1();
-Bn256.mul(sign, H, s); // signature of m = s H
+Mcl.mul(sign, H, s); // signature of m = s H
 
 GT e1 = new GT();
 GT e2 = new GT();
-Bn256.pairing(e1, H, pub); // e1 = e(H, s Q)
-Bn256.pairing(e2, sign, Q); // e2 = e(s H, Q);
+Mcl.pairing(e1, H, pub); // e1 = e(H, s Q)
+Mcl.pairing(e2, sign, Q); // e2 = e(s H, Q);
 assertBool("verify signature", e1.equals(e2));
 ```
 
 # Make test
 ```
-cd java
-make test_bn256
+cd ffi/java
+make test
 ```
 
 # Sample code
-[Bn256Test.java](https://github.com/herumi/mcl/blob/master/java/Bn256Test.java)
+[MclTest.java](https://github.com/herumi/mcl/blob/master/ffi/java/MclTest.java)
diff --git a/readme.md b/readme.md
index a703581..9246710 100644
--- a/readme.md
+++ b/readme.md
@@ -430,7 +430,7 @@ K. Shimizu, and T. Teruya. ASIACCS 2018
 * [she-api(Japanese)](https://github.com/herumi/mcl/blob/master/misc/she/she-api-ja.md)
 
 # Java API
-See [java.md](https://github.com/herumi/mcl/blob/master/java/java.md)
+See [java.md](https://github.com/herumi/mcl/blob/master/ffi/java/java.md)
 
 # License