Java 值传递和引用传递

public class JavaTest {
    private int paraInt = 10;

    public int getParaInt() {
        return paraInt;
    }

    public void setParaInt(int paraInt) {
        this.paraInt = paraInt;
    }
    
    public void tryChangeBasicData(int para){
        para = 100;
        System.out.println("inner tryChangeBasicData method:para = " + para);
    }
    
    public void tryChangeObject(JavaTest jTest){
        jTest.setParaInt(100);
        System.out.println("inner tryChangeObject method:para = " + jTest.getParaInt());
    }
    
    public static void main(String[] args) {
        JavaTest jTest = new JavaTest();
        
        System.out.println("基本数据类型作为参数传递");
        System.out.println("before method: " + jTest.getParaInt());
        jTest.tryChangeBasicData(jTest.getParaInt());
        System.out.println("after method: " + jTest.getParaInt());
        
        System.out.println("");
        
        System.out.println("对象引用作为参数传递");
        System.out.println("before method: " + jTest.getParaInt());
        jTest.tryChangeObject(jTest);
        System.out.println("after method: " + jTest.getParaInt());
    }
}

基本数据类型作为参数传递
before method: 10
inner tryChangeBasicData method:para = 100
after method: 10
***
对象引用作为参数传递
before method: 10
inner tryChangeObject method:para = 100
after method: 100