brew tap guxingke/repo && brew install mini-jvm

cat <<EOF > HelloWorld.java
public class HelloWorld {
  public static void main(String[] args) {
    if (args.length == 0) {
      System.out.println("hello");
      return;
    }

    for(int i = 0; i < args.length; i ++) {
      System.out.println(args[i]);
    }
  }
}
EOF

javac HelloWorld.java

# no args
mini-jvm HelloWold
# => hello

# with program args
mini-jvm HelloWold hello mini-jvm
# =>  hello
# =>  mini-jvm

# 输入 mini-jvm -help 了解更多.

cat <<EOF > Sum10.java
public class Sum10 {
  public static void main(String[] args) {
    int sum = sum10();
    System.out.println(sum);
  }
  
  public static int sum10() {
    int sum = 0;
    for (int i = 1; i <= 10; i++) {
      sum += i;
    }
    return sum;
  }
}
EOF

javac Sum10.java
java Sum10
# => 55

# 生成类汇编语言
# mini-jvm --bc [classfile] [method]
mini-jvm --bc Sum10.class sum10 > sum10.bc

# 解释上一步生成的 sum10.bc
# mini-jvm -- [bytecode file]
mini-jvm -- sum10.bc
# => 55

# ================================