如何将方法的字符串参数从一个类传递到同一个命名空间中的另一个类？

public class TargetClass {
    private String param;

    public TargetClass(String param) {
        this.param = param;
    }

    public void method() {
        System.out.println("The parameter is: " + param);
    }
}

public class SourceClass {
    public void test() {
        String param = "Hello";
        TargetClass target = new TargetClass(param);
        target.method();
    }
}

public class TargetClass {
    private String param;

    public void setParam(String param) {
        this.param = param;
    }

    public void method() {
        System.out.println("The parameter is: " + param);
    }
}

public class SourceClass {
    public void test() {
        String param = "Hello";
        TargetClass target = new TargetClass();
        target.setParam(param);
        target.method();
    }
}

public class TargetClass {
    public static String param;

    public void method() {
        System.out.println("The parameter is: " + param);
    }
}

public class SourceClass {
    public void test() {
        String param = "Hello";
        TargetClass.param = param;
        TargetClass target = new TargetClass();
        target.method();
    }
}

public interface ParamProvider {
    String getParam();
}

public class TargetClass implements ParamProvider {
    private String param;

    public TargetClass(String param) {
        this.param = param;
    }

    public void method() {
        System.out.println("The parameter is: " + param);
    }

    @Override
    public String getParam() {
        return param;
    }
}

public class SourceClass {
    public void test() {
        String param = "Hello";
        TargetClass target = new TargetClass(param);
        System.out.println("The parameter is: " + target.getParam());
        target.method();
    }
}