diff --git a/compile-run-with-classpath/solution.sh b/compile-run-with-classpath/solution.sh
index 292074f..60945fa 100644
--- a/compile-run-with-classpath/solution.sh
+++ b/compile-run-with-classpath/solution.sh
@@ -7,3 +7,7 @@
 # First argument is blank: true
 # Second argument is blank: true
 # Third argument is blank: false
+a= '*'
+javac -cp commons-lang3-3.9.jar StringIsBlank.java
+java -cp ./commons-lang3-3.9.jar:.   StringIsBlank "" ' ' a
+
diff --git a/read-env-variable-system-property/solution.sh b/read-env-variable-system-property/solution.sh
index 1dfb638..c0ca77c 100644
--- a/read-env-variable-system-property/solution.sh
+++ b/read-env-variable-system-property/solution.sh
@@ -6,3 +6,6 @@
 # 使得该java命令输出：
 # Environment variable AAA: $A;
 # System property BBB: '
+export AAA=\$A
+javac ReadEnvironmentVariableAndSystemProperty.java
+java -DBBB=\' ReadEnvironmentVariableAndSystemProperty
diff --git a/system-out-system-err/solution.sh b/system-out-system-err/solution.sh
index 5cdeb2b..242fc61 100644
--- a/system-out-system-err/solution.sh
+++ b/system-out-system-err/solution.sh
@@ -2,3 +2,5 @@
 # 请在这里编写两条命令：
 # 1. 在当前目录中，使用javac命令编译PrintSystemOutSystemErr.java
 # 2. 在当前目录中，使用java命令运行PrintSystemOutSystemErr，使其标准输出和标准错误都重定向到当前目录下一个名为output.txt的文件中
+javac PrintSystemOutSystemErr.java
+java PrintSystemOutSystemErr >output.txt 2>&1