diff --git a/src/run1-1.sh b/src/run1-1.sh
index 555d814..9e603d4 100755
--- a/src/run1-1.sh
+++ b/src/run1-1.sh
@@ -1,7 +1,7 @@
 #!/bin/bash
 
 # javac によるコンパイル
-javac j1/Hello.java
+javac -encoding UTF-8 j1/Hello.java
 
 # java によるHello.class の実行 (ファイル名の .classは省略する)
 java j1/Hello
@@ -14,7 +14,7 @@
 read input_str
 
 # javac によるコンパイル
-javac j1/HelloNW.java
+javac -encoding UTF-8 j1/HelloNW.java
 
 # java コマンドによるHelloNW.class の実行
 java j1/HelloNW
diff --git a/src/run1-2.sh b/src/run1-2.sh
index 9d5cc50..c23323b 100755
--- a/src/run1-2.sh
+++ b/src/run1-2.sh
@@ -1,13 +1,13 @@
 #!/bin/bash
 
-javac j1/PrintArgs.java 
+javac -encoding UTF-8 j1/PrintArgs.java 
 
 java j1/PrintArgs ABC 123
 
 echo "type return to continue / CTRL+C to quit"
 read input_str
 
-javac j1/TestThread.java
+javac -encoding UTF-8 j1/TestThread.java
 
 java j1/TestThread
 
diff --git a/src/run1-3.sh b/src/run1-3.sh
index c6ba8a5..d0a56c1 100755
--- a/src/run1-3.sh
+++ b/src/run1-3.sh
@@ -1,13 +1,13 @@
 #!/bin/bash
 
-javac j1/ReadFile.java 
+javac -encoding UTF-8 j1/ReadFile.java 
 
 java j1/ReadFile j1/ReadFile.java
 
 echo "type return to continue / CTRL+C to quit"
 read input_str
 
-javac j1/WriteFile.java
+javac -encoding UTF-8 j1/WriteFile.java
 
 head -n 10 j1/WriteFile.java
 echo "type return to continue / CTRL+C to quit"
@@ -22,7 +22,7 @@
 echo "type return to continue / CTRL+C to quit"
 read input_str
 
-javac j1/ReadWrite.java
+javac -encoding UTF-8 j1/ReadWrite.java
 
 echo "なにか入力してEnterを押すと、エコーバックされる。CTRL+C to quit"
 java j1/ReadWrite
diff --git a/src/run2-1.sh b/src/run2-1.sh
index a08441f..6e1a740 100755
--- a/src/run2-1.sh
+++ b/src/run2-1.sh
@@ -1,6 +1,6 @@
 #!/bin/bash
 
-javac j2/*.java 
+javac -encoding UTF-8 j2/*.java 
 
 echo "Now, open other terminal, and execute Client (ReadNet)"
 echo ">>>>   $ java j2/ReadNet";